Scientists Have Made Bose-Einstein Condensates in Space for the First Time (technologyreview.com) 22
On board the International Space Station since May 2018 is a mini-fridge-size facility called the Cold Atom Lab (CAL), capable of chilling atoms in a vacuum down to temperatures one ten billionth of a degree above absolute zero. It is, for all intents and purposes, one of the coldest spots in the known universe. And according to a new study published in Nature, scientists have just used it to create a rare state of matter for the first time ever in space. From a report: Bose-Einstein condensates, sometimes called the fifth state of matter, are gaseous clouds of atoms that stop behaving like individual atoms and start to behave like a collective. BECs, as they're often called, were first predicted by Albert Einstein and Satyendra Nath Bose over 95 years ago, but they were first observed in the lab by scientists just 25 years ago. The general idea when making a BEC is to inject atoms (in the case of CAL, rubidium and potassium) into an ultra-cold chamber to slow them down. A magnetic trap is then created in the chamber with an electrified coil, which is used along with lasers and other tools to move the atoms into a dense cloud. At this point the atoms "kind of blur into one another," says David Aveline, a physicist at NASA's Jet Propulsion Laboratory, and the lead author of the new study.
To run experiments using a BEC, you need to turn down or release the magnetic trap. The cloud of crowded atoms will expand, which is useful because BECs need to stay cold, and gases tend to cool off as they expand. But if the atoms in a BEC get too far apart, they no longer behave like a condensate. This is where the microgravity of low Earth orbit comes into play. If you try to increase the volume on Earth, says Aveline, gravity will just pull the atoms in the center of the BEC cloud down to the bottom of the trap until they spill out, distorting the condensate or ruining it entirely. But in microgravity, the tools in the CAL can hold the atoms together even as the trap's volume increases. That makes for a longer-lived condensate, which in turn allows scientists to study it longer than they could on Earth (this initial demonstration ran for 1.118 seconds, although the goal is to be able to detect the cloud for up to 10 seconds). Though only a first step, the CAL experiment could one day allow BECs to form the basis of ultra-sensitive instruments that detect faint signals from some of the universe's most mysterious phenomena, like gravitational waves and dark energy. From a more practical perspective, Aveline believes the team's work could pave the way for better inertial sensors. "The applications range from accelerometers and seismometers to gyroscopes," he says.
To run experiments using a BEC, you need to turn down or release the magnetic trap. The cloud of crowded atoms will expand, which is useful because BECs need to stay cold, and gases tend to cool off as they expand. But if the atoms in a BEC get too far apart, they no longer behave like a condensate. This is where the microgravity of low Earth orbit comes into play. If you try to increase the volume on Earth, says Aveline, gravity will just pull the atoms in the center of the BEC cloud down to the bottom of the trap until they spill out, distorting the condensate or ruining it entirely. But in microgravity, the tools in the CAL can hold the atoms together even as the trap's volume increases. That makes for a longer-lived condensate, which in turn allows scientists to study it longer than they could on Earth (this initial demonstration ran for 1.118 seconds, although the goal is to be able to detect the cloud for up to 10 seconds). Though only a first step, the CAL experiment could one day allow BECs to form the basis of ultra-sensitive instruments that detect faint signals from some of the universe's most mysterious phenomena, like gravitational waves and dark energy. From a more practical perspective, Aveline believes the team's work could pave the way for better inertial sensors. "The applications range from accelerometers and seismometers to gyroscopes," he says.
Wait... (Score:2)
Yep. (Score:2, Funny)
Outta this world.
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Send feedback to Slashdot (Score:1)
MOD DOWN! The poster, "Baby Yoda's Daddy" is cre|mer!!! "Baby Yoda's Daddy" is one of the 150+ sock puppet accounts he owns in order to manipulate the Slashdot moderation system!
This is absolutely correct and management knows about it. (I don't have mod points ATM.)
If you get a moment, send a copy of your post to feedback@slashdot.org and mention your evidence. When I did that I got a personal reply, although I don't think management does anything.
Not really (Score:1)
Bose speakers now sound better then ever before?
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All that crazy white hair really messes with the sound.
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Once more SciFi got there first... (Score:2)
Spectral the movie...
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Re: Once more SciFi got there first... (Score:2)
It was definitely better than I thought it would be.
So that's the kernel of the Borg origin story (Score:2)
Finally some nerd news (Score:5, Insightful)
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Very cool, and one of the main reasons to have a space station, so you can do science you cannot do on earth.
I see what you did there!
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Comment removed (Score:5, Funny)
Re:atoms in a vacuum (Score:5, Funny)
It's all about atomic distancing, these days.
Re:atoms in a vacuum (Score:4, Insightful)
What's your definition? All vacuums have atoms. Interstellar space has about 1 atom per cc, intergalactic 1 per cubic meter. We can't make vacuums like that on earth.
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We can't make vacuums like that on earth.
Oh, that sucks. Well, at least in space nobody can hear you when you're vacuuming.