Gravitational waves from two colliding black holes were first detected last September and announced in February. This week, the same science team announced a second wave detection of two smaller black holes in December.
A black hole’s gravity is so strong that even light can’t escape, so black holes are essentially impossible to see with telescopes. But they do give off gravitational waves.
“Light’s always been how we do astronomy,” Professor Jo Dunkley, an astrophysicist at Oxford University who didn’t work on the experiment, told BuzzFeed News. “Everything we know about space, we’ve got from light. This can show the stuff you can’t see with light.”
Counting black holes, combining telescope with gravitational measurements to better understand neutron stars, all the usual origin-of-the-universe stuff.
If gravitational waves don’t require cataclysmic collisions between enormous black holes for us to measure them, but can be detected on the regular, we can use them to try to figure out a whole lot more than just whether or not Einstein was totally right. That is a very nice tool to have in your pocket.
Luc Bergeron’s Space Story is a mashup of more than 20 movies that take place in space, from Alien to Apollo 13 to 2001 to Star Trek to Moon. Stick with it for a couple minutes…it starts slow but gets going around then.
The Airbus A380 is currently the world’s largest passenger jet. Depending on the seating configuration, the A380 can carry anywhere from 400 to 615 passengers and is certified for up to 853 passengers.
As of November 2013, only 536 people have ever been in space (any flight above 100 kilometres).1The listing of their names on Wikipedia is shorter than the site’s page on Game of Thrones. Only 24 of those people left low Earth orbit (on the Apollo missions) and only 12 of those men set foot on the Moon. Seven of the moon walkers are still alive; they’re all in their 80s. Six people are currently in space.
We’ve been sending humans into space for 55 years. That’s an average of about 10 people per year if you don’t count repeats. Human space exploration is still very much in its infancy.
You’ll also note this is fewer than the number of members of the US Congress. FYI, there are only five people who have been in space and served in Congress, two of whom went while serving in Congress.↩
A new video from Kurzgesagt explores the limits of human exploration in the Universe. How far can we venture? Are there limits? Turns out the answer is very much “yes”…with the important caveat “using our current understanding of physics”, which may someday provide a loophole (or wormhole, if you will). Chances are, humans will only be able to explore 0.00000000001% of the observable Universe.
This video is particularly interesting and packed with information, even by Kurzgesagt’s standards. The explanation of the Big Bang, inflation, dark matter, and expansion is concise and informative…the idea that the Universe is slowly erasing its own memory is fascinating.
About 13 times per century, the planets align in the heavens and the Earth can watch Mercury crossing the face of the Sun. NASA’s Solar Dynamics Observatory was watching too and captured time lapse videos from several angles using various instruments measuring magnetism, visible light, and UV. The cosmic ballet goes on.
Russian billionaire Yuri Milner, with the help of Stephen Hawking and Mark Zuckerburg, plans to launch a fleet of nano-probes1 toward a star close to our solar system, Alpha Centuri. The craft, outfitted with lightsails, will be pushed along to their destination in just 20 years by powerful lasers on Earth.
In the last decade and a half, rapid technological advances have opened up the possibility of light-powered space travel at a significant fraction of light speed. This involves a ground-based light beamer pushing ultra-light nanocrafts - miniature space probes attached to lightsails - to speeds of up to 100 million miles an hour. Such a system would allow a flyby mission to reach Alpha Centauri in just over 20 years from launch, and beam home images of possible planets, as well as other scientific data such as analysis of magnetic fields.
Breakthrough Starshot aims to demonstrate proof of concept for ultra-fast light-driven nanocrafts, and lay the foundations for a first launch to Alpha Centauri within the next generation. Along the way, the project could generate important supplementary benefits to astronomy, including solar system exploration and detection of Earth-crossing asteroids.
The latest video from Kurzgesagt is on space elevators. How would you build one? Why not just keep launching rockets into space instead? Would be easier to build one on the Moon first?
In 1989, a Rockwell engineer named Ron Jones published his Integrated Space Plan, a detailed outline of the next 100 years of human space travel, from continuing shuttle missions in the 1990s to the large scale habitation of Mars. The plan includes all sorts of futuristic and day-dreamy phrases like:
Create new moons for Mars if required
Humanity begins the transition from a terrestrial to a solar species
Humanity commands unlimited resources from the Moon and asteroids
Space drives global economy
Independent spacefaring human communities
The graphic is divided into nine columns that show, in chronological order, the path toward human exploration of deep space. The center row of boxes, the “critical path,” outlines the major milestones Jones decided were attainable within the next century of space travel; the boxes to the left and right of the critical path are support elements that must be realized before anything on the critical path can happen. The Integrated Space Plan can be read top to bottom and left to right. The big circles intersecting the boxes are the the plan’s overarching long-range goals, which include things like Humanity begins the transition from a terrestrial to a solar species and Human expansion into the cosmos. In many ways, it’s a graphical to-do list.
The keen observer will note that we are waaaaay behind in the plan. A lunar outpost was supposed to be up and running before 2008 and a self-supporting lunar base is due to happen in the next year or two. Can Musk and Bezos get us back on track? (via @ftrain)
A new print from Pop Chart Lab “traces the trajectories of every orbiter, lander, rover, flyby, and impactor to ever slip the surly bonds of Earth’s orbit and successfully complete its mission — a truly astronomical array of over 100 exploratory instruments in all.” Awesome. Basically, I am a sucker for things with curvy lines and planets.
The Japanese satellite Himawari caught yesterday’s total solar eclipse as it moved across the Pacific Ocean.
Update:@paulmison sent along some better views of the eclipse: here and here. I tried to find a better YouTube embed, but no dice. This one, taken of the eclipse in Micronesia, is pretty amazing though…you can see the solar flares coming off the surface of the Sun as it reaches totality. Holy shit, I’m getting excited for Eclipsathon 2017!
First contact with an alien civilization will be a momentous event in the history of Earth. Unless the other civilization is kind of a dick. Tim Urban didn’t quite cover this scenario in his post about the Fermi Paradox.
We Can’t Live Without Cosmos is Konstantin Bronzit’s 15-minute short film nominated for a 2016 Academy Award in the animated short category. It is about two friends who dream of going into space together.
They’re best friends who revolve in the same centrifuge, swim in neighboring lanes, and read together at night. Their happiness and exuberance is infectious. It lifts the stone-faced scientists who track their progress; it even expresses itself in their space suits, which are winsomely shaped to accommodate their slightly different heads (one is square, the other rectangular). Even as they prepare for their high-tech journey, they embody old-fashioned, noble virtues: bravery, curiosity, strength, tenderness.
For her new book, Ariel Waldman asked dozens of astronauts about their experiences in space.
With playful artwork accompanying each, here are the real stories behind backwards dreams, “moon face,” the tricks of sleeping in zero gravity and aiming your sneeze during a spacewalk, the importance of packing hot sauce, and dozens of other cosmic quirks and amazements that come with travel in and beyond low Earth orbit.
Waldman is the co-creator of the very cool spaceprob.es.
Update:This book is now out, shipping, released…launched, if you will.
Today is the 30th anniversary of the final launch and subsequent catastrophic loss of the Space Shuttle Challenger. Popular Mechanics has an oral history of the launch and aftermath.
Capano: We got the kids quiet, and then I remember that the line that came across the TV was “The vehicle has exploded.” One of the girls in my classroom said, “Ms. Olson [Capano’s maiden name], what do they mean by ‘the vehicle’?” And I looked at her and I said, “I think they mean the shuttle.” And she got very upset with me. She said, “No! No! No! They don’t mean the shuttle! They don’t mean the shuttle!”
Raymond: The principal came over the PA system and said something like, “We respectfully request that the media leave the building now. Now.” Some of the press left, but some of them took off into the school. They started running into the halls to get pictures, to get sound-people were crying, people were running. It was chaos. Some students started chasing after journalists to physically get them out of the school.
I have certainly read about Feynman’s O-ring demonstration during the investigation of the disaster, but I hadn’t heard this bit:
Kutyna: On STS-51C, which flew a year before, it was 53 degrees [at launch, then the coldest temperature recorded during a shuttle launch] and they completely burned through the first O-ring and charred the second one. One day [early in the investigation] Sally Ride and I were walking together. She was on my right side and was looking straight ahead. She opened up her notebook and with her left hand, still looking straight ahead, gave me a piece of paper. Didn’t say a single word. I look at the piece of paper. It’s a NASA document. It’s got two columns on it. The first column is temperature, the second column is resiliency of O-rings as a function of temperature. It shows that they get stiff when it gets cold. Sally and I were really good buddies. She figured she could trust me to give me that piece of paper and not implicate her or the people at NASA who gave it to her, because they could all get fired.
I wondered how I could introduce this information Sally had given me. So I had Feynman at my house for dinner. I have a 1973 Opel GT, a really cute car. We went out to the garage, and I’m bragging about the car, but he could care less about cars. I had taken the carburetor out. And Feynman said, “What’s this?” And I said, “Oh, just a carburetor. I’m cleaning it.” Then I said, “Professor, these carburetors have O-rings in them. And when it gets cold, they leak. Do you suppose that has anything to do with our situation?” He did not say a word. We finished the night, and the next Tuesday, at the first public meeting, is when he did his O-ring demonstration.
We were sitting in three rows, and there was a section of the shuttle joint, about an inch across, that showed the tang and clevis [the two parts of the joint meant to be sealed by the O-ring]. We passed this section around from person to person. It hit our row and I gave it to Feynman, expecting him to pass it on. But he put it down. He pulled out pliers and a screwdriver and pulled out the section of O-ring from this joint. He put a C-clamp on it and put it in his glass of ice water. So now I know what he’s going to do. It sat there for a while, and now the discussion had moved on from technical stuff into financial things. I saw Feynman’s arm going out to press the button on his microphone. I grabbed his arm and said, “Not now.” Pretty soon his arm started going out again, and I said, “Not now!” We got to a point where it was starting to get technical again, and I said, “Now.” He pushed the button and started the demonstration. He took the C-clamp off and showed the thing does not bounce back when it’s cold. And he said the now-famous words, “I believe that has some significance for our problem.” That night it was all over television and the next morning in the Washington Post and New York Times. The experiment was fantastic-the American public had short attention spans and they didn’t understand technology, but they could understand a simple thing like rubber getting hard.
I never talked with Sally about it later. We both knew what had happened and why it had happened, but we never discussed it. I kept it a secret that she had given me that piece of paper until she died [in 2012].
Whoa, dang. Also not well known is that the astronauts survived the initial explosion and were possibly alive and conscious when they hit the water two and a half minutes later.
Over the December holiday, I read 10:04 by Ben Lerner (quickly, recommended). The novel includes a section on the Challenger disaster and how very few people saw it live:
The thing is, almost nobody saw it live: 1986 was early in the history of cable news, and although CNN carried the launch live, not that many of us just happened to be watching CNN in the middle of a workday, a school day. All other major broadcast stations had cut away before the disaster. They all came back quickly with taped replays, of course. Because of the Teacher in Space Project, NASA had arranged a satellite broadcast of the mission into television sets in many schools — and that’s how I remember seeing it, as does my older brother. I remember tears in Mrs. Greiner’s eyes and the students’ initial incomprehension, some awkward laughter. But neither of us did see it: Randolph Elementary School in Topeka wasn’t part of that broadcast. So unless you were watching CNN or were in one of the special classrooms, you didn’t witness it in the present tense.
Oh, the malleability of memory. I remember seeing it live too, at school. My 7th grade English teacher permanently had a TV in her room and because of the schoolteacher angle of the mission, she had arranged for us to watch the launch, right at the end of class. I remember going to my next class and, as I was the first student to arrive, telling the teacher about the accident. She looked at me in disbelief and then with horror as she realized I was not the sort of kid who made terrible stuff like that up. I don’t remember the rest of the day and now I’m doubting if it happened that way at all. Only our classroom and a couple others watched it live — there wasn’t a specially arranged whole-school event — and I doubt my small school had a satellite dish to receive the special broadcast anyway. Nor would we have had cable to get CNN…I’m not even sure cable TV was available in our rural WI town at that point. So…?
But, I do remember the jokes. The really super offensive jokes. The jokes actually happened. Again, from 10:04:
I want to mention another way information circulated through the country in 1986 around the Challenger disaster, and I think those of you who are more or less my age will know what I’m talking about: jokes. My brother, who is three and a half years older than I, would tell me one after another as we walked to and from Randolph Elementary that winter: Did you know that Christa McAuliffe was blue-eyed? One blew left and one blew right; What were Christa McAuliffe’s last words to her husband? You feed the kids — I’ll feed the fish; What does NASA stand for? Need Another Seven Astronauts; How do they know what shampoo Christa McAuliffe used? They found her head and shoulders. And so on: the jokes seemed to come out of nowhere, or to come from everywhere at once; like cicadas emerging from underground, they were ubiquitous for a couple of months, then disappeared. Folklorists who study what they call ‘joke cycles’ track how — particularly in times of collective anxiety — certain humorous templates get recycled, often among children.
At the time, I remember these jokes being hilarious1 but also a little horrifying. Lerner continues:
The anonymous jokes we were told and retold were our way of dealing with the remainder of the trauma that the elegy cycle initiated by Reagan-Noonan-Magee-Hicks-Dunn-C.A.F.B. (and who knows who else) couldn’t fully integrate into our lives.
Even in the extermination camps, the children who were still healthy enough to move around played. In one camp they played a game called “tickling the corpse.” At Auschwitz-Birkenau they dared one another to touch the electric fence. They played “gas chamber,” a game in which they threw rocks into a pit and screamed the sounds of people dying.
Also, does anyone remember the dead baby jokes? They were all the rage when I was a kid. There were books of them. “Q: What do you call a dead baby with no arms and no legs laying on a beach? A: Sandy.” And we thought they were funny as hell.↩
The Cassini spacecraft took a photo of two moons of Saturn, Tethys and Enceladus, beautifully aligned with each other. The cosmic ballet goes on. (via slate)
As of last month, 685 multi-planet solar systems (with 1705 planets) have been discovered outside our own. This video shows the relative sizes of those systems compared to ours. Please note:
The size of the orbits are all to scale, but the size of the planets are not. For example, Jupiter is actually 11x larger than Earth, but that scale makes Earth-size planets almost invisible (or Jupiters annoyingly large).
When you see photos of Jupiter, they’re almost always the of same view: the north pole at the top, the gaseous bands perfectly horizontal, and the Red Spot somewhere in the mix. But @robdubbin reminds us that there are other ways of looking at Jupiter. Here’s a view of the planet’s southern hemisphere:
NASA’s New Horizons probe has sent back the first of the sharpest images of Pluto it took during its July flyby of the planet.1
These latest images form a strip 50 miles (80 kilometers) wide on a world 3 billion miles away. The pictures trend from Pluto’s jagged horizon about 500 miles (800 kilometers) northwest of the informally named Sputnik Planum, across the al-Idrisi mountains, over the shoreline of Sputnik, and across its icy plains.
A European Space Agency probe will be launched into space early next month to help test the last major prediction of Einstein’s theory of general relativity: the existence of gravitational waves.
Gravitational waves are thought to be hurled across space when stars start throwing their weight around, for example, when they collapse into black holes or when pairs of super-dense neutron stars start to spin closer and closer to each other. These processes put massive strains on the fabric of space-time, pushing and stretching it so that ripples of gravitational energy radiate across the universe. These are gravitational waves.
The Lisa Pathfinder probe won’t measure gravitational waves directly, but will test equipment that will be used for the final detector.
LISA Pathfinder will pave the way for future missions by testing in flight the very concept of gravitational wave detection: it will put two test masses in a near-perfect gravitational free-fall and control and measure their motion with unprecedented accuracy. LISA Pathfinder will use the latest technology to minimise the extra forces on the test masses, and to take measurements. The inertial sensors, the laser metrology system, the drag-free control system and an ultra-precise micro-propulsion system make this a highly unusual mission.
A rocket built by Blue Origin, an aerospace company backed by Jeff Bezos, recently reached space and executed a controlled landing back on Earth, which allows it to be used again. Bezos himself joined Twitter1 this morning to announce the news. Elon Musk, whose SpaceX company has been trying (and failing) to do something similar lately, congratulated Bezos and his team on Twitter2 but also threw a little shade on BO’s efforts to reach “space” vs. SpaceX’s efforts to reach “orbit”.
It is, however, important to clear up the difference between “space” and “orbit”, as described well by https://what-if.xkcd.com/58/. Getting to space needs ~Mach 3, but GTO orbit requires ~Mach 30. The energy needed is the square, i.e. 9 units for space and 900 for orbit.
Welcome to Twitter, Jeff.
I like his bio: “Amazon, Blue Origin, Washington Post”.↩
Musk’s bio reads: “Tesla, SpaceX, SolarCity & PayPal”. Oh, these boys and their toys.↩
The Cassini probe, launched from Earth in 1997 (six months before I started publishing kottke.org), has been taking photos of Saturn and its moons for 11 years now. The Wall Street Journal has a great feature that shows exactly what the probe has been looking at all that time. (Note: the video above features flashing images, so beware if that sort of thing is harmful to you.)
In a nod to our nation’s recreational drug users, NASA has created this 30-minute ultra high-resolution look at our Sun, assembled from thousands of photographs taken by the Solar Dynamics Observatory, which snaps a 16-megapixel image of the Sun every few seconds. Duuuuuuuude…
Discovering life was not on the agenda when Cassini was designed and launched two decades ago. Its instruments can’t capture microbes or detect life, but in a couple of dozen passes through the plumes of Enceladus, it has detected various molecules associated with life: water vapor, carbon dioxide, methane, molecular nitrogen, propane, acetylene, formaldehyde and traces of ammonia.
Wednesday’s dive will be the deepest Cassini will make through the plumes, only 30 miles above the icy surface. Scientists are especially interested in measuring the amount of hydrogen gas in the plume, which would tell them how much energy and heat are being generated by chemical reactions in hydrothermal vents at the bottom of the moon’s ocean.
That’s pretty crazy…it sounds like science fiction. NASA is doing a wonderful job producing great science with the lean budgets they are given.
Of the many possibilities, I’d like to point out just three interesting things.
1. Times Square! And not just that, but the whole of central Midtown is now lit up like a Christmas tree from 34th Street to Central Park.
2. The bright spot of light in the upper right corner of the image above is Citi Field. The photo must have been taken during Game 1 of the NLCS between the Mets and the Cubs. The Mets won that game 4-2. #LGM!
3. You’ll notice that the streetlights in much of the city are orange. But in the bottom right corner, in Brooklyn, you can see the future. NYC is currently replacing all of the orange-glowing sodium vapor streetlights with blue-glowing LED lights that are longer lasting and more energy efficient. But they are also brighter and some are already complaining about the harsh blue light.
The new LEDs may be environmentally sensitive, but they are also optically harsh.
“The old lights made everybody look bad,” said Christopher Stoddard, an architect, who lives at the corner of Fuller Place. “But these are so cold and blue, it’s like ‘Night of the Living Dead’ out there.”
“We’re all for saving energy,” his wife, Aida Stoddard, also an architect, said, “but the city can do so much better.”
A few blocks away, Rose Gallitelli taped up black garbage bags on her bedroom windows so that she could sleep. “They’re the heavy-duty kind,” she said.
The lighting refit is scheduled to be completed in two years. The city will look different when it’s done, in real life, on Instagram, and in film. (via @ginatrapani)
When the Curiosity rover landed on the surface of Mars, it took high-resolution photos all the way down. Luke Fitch took those photos and stitched them together into a first-person HD video of the rover’s landing.
Update: I was wondering if someone had done a stabilized version of this video and lo:
In a paper published in the journal Nature Geoscience, Dr. McEwen and other scientists identified waterlogged molecules — salts of a type known as perchlorates - in readings from orbit.
“That’s a direct detection of water in the form of hydration of salts,” Dr. McEwen said. “There pretty much has to have been liquid water recently present to produce the hydrated salt.”
By “recently,” Dr. McEwen said he meant “days, something of that order.”
This is fantastic timing for the release of The Martian movie, which comes out this weekend.
“Our quest on Mars has been to ‘follow the water,’ in our search for life in the universe, and now we have convincing science that validates what we’ve long suspected,” said John Grunsfeld, astronaut and associate administrator of NASA’s Science Mission Directorate in Washington. “This is a significant development, as it appears to confirm that water — albeit briny — is flowing today on the surface of Mars.”
These downhill flows, known as recurring slope lineae (RSL), often have been described as possibly related to liquid water. The new findings of hydrated salts on the slopes point to what that relationship may be to these dark features. The hydrated salts would lower the freezing point of a liquid brine, just as salt on roads here on Earth causes ice and snow to melt more rapidly. Scientists say it’s likely a shallow subsurface flow, with enough water wicking to the surface to explain the darkening.
A pair of filmmakers, Wylie Overstreet and Alex Gorosh, built a scale model of the solar system in the Nevada desert and made a time lapse of the result. For orbits, they drove their car in circles around “the Sun”. The Earth they used was the size of a marble, which made Neptune’s orbit seven miles across. (via the kid should see this)
Stay Connected