Man, this one is cutting edge. If they can pull off an actual space-based gravity wave detection rig, I will be so chuffed. It has immense potential for discovery of new and interesting things.
Please explain to us laypeople what this could do for us?
Being a particularly dumb fellow layman but seeing no other comments after 18h…
I’m picturing a ruler thrown into gravity waves and another ruler somehow measuring the parts of the first one where millimeter markers stop being one millimeter apart.
Now for Gemini’s summary:
Space-based gravitational wave detection is the study of ripples in spacetime using observatories positioned in orbit rather than on Earth. While ground-based detectors like LIGO and Virgo have already proven these waves exist, they are limited by their size and Earth’s seismic “noise.”
How It Works
Space-based detection uses laser interferometry across millions of kilometers of vacuum.
• The Formation: LISA will consist of three spacecraft flying in a triangular formation, roughly 2.5 million kilometers apart, orbiting the Sun behind the Earth.
• The “Arms”: Each spacecraft contains “test masses” (gold-platinum cubes) that float freely in a vacuum, shielded from solar wind and radiation.
• The Measurement: Lasers are fired between the spacecraft to monitor the distance between these cubes. When a gravitational wave passes through the formation, it causes the fabric of space to stretch and squeeze, changing the distance between the cubes by a fraction of an atom’s width.
… Honestly I’m feeling reasonably good about my dummy understanding. The “rulers” are lasers being shot between satellites all around the Earth, but I think it sounds roughly right?
Good explanation. Yep, it detects the squeezing and stretching of space itself in two directions at right angles to each other, by bouncing light back and forth. Insane technology, that was pure sci-fi only a century ago, but now we can do it.
Astronomy is one of those things that is hard to directly justify in terms of material benefits, but always remains popular with the public. The technology used to build telescopes and such usually has tech benefits for things you may not expect, which is good.
However, the knowledge of what is out there in the universe is a benefit in itself. The ability to make long-term plans and stick to them is one of the advantages of socialism, or any effective form of government, and you need knowledge to make goals.
We don’t know ahead of time what the gravity wave telescope will tell us. We can speculate, and we know it will give us better details about the things we’ve already detected with the ones here on Earth. But we do not know for sure, and that is exciting.
It could change our whole understanding of what the universe is, of what it is made of, etc. It could even find evidence of intelligent life.
A sufficiently advanced culture could modify a pair of orbiting black holes to produce modulated gravity wave signals, and there is nothing to stop those signals being heard on the other side of the universe, unlike the sort of radio waves we currently look for in SETI and similar programs. It sounds sci-fi, but it’s possible. And if anyone in the observable universe is doing it, we would know. And it would be evidence that life can be far more advanced than we have evidence for now.
