Top Tweets for #askethan
How did Artemis II break Apollo’s distance record?
#AskEthan
If you ask google how Artemis II broke Apollo 13's distance record, it'll lie and say "because the rocket was more powerful."
But these three reasons, combined, are how it really happened.
https://t.co/lqbj3u00kP
How dark will the Universe become?
#AskEthan
Sure, dark energy will empty out the Universe and galaxies will run out of fuel to form new stars.
But that doesn't mean our sky will only get darker.
Look forward to the brightness ahead.
https://t.co/huqNduzpjh
Do signals degrade as they travel through space?
#AskEthan
Light and gravitational waves redshift, sure, as they travel through the expanding Universe.
But do those signals degrade and deteriorate, and if so, what do we lose?
https://t.co/FiPTefNu5x
Can quantum entanglement survive a black hole?
#AskEthan
When one member of an entangled pair of particles falls into the black hole, is the entanglement broken?
And if not, is there any way to test and confirm its persistence?
https://t.co/utYtmAWfBz
Will anything persist when the Universe dies?
#AskEthan
The last star will burn out, the last black hole will decay, and entropy will reach its maximum: a heat death.
After all that, can any trace of our existence still persist?
https://t.co/MsyVxCsasB
Can we see the expanding Universe changing?
#AskEthan
We've measured the expanding Universe by looking at many objects at different distances and with different redshifts.
Here's how we'll measure it directly: with just one object over time.
https://t.co/rVVv98rMmN
How long can the longest-lived star shine?
#AskEthan
It's been 13.8 billion years since the Big Bang, but the longest-lived stars will shine for many trillions of years.
How long do we have before the last survivor goes out?
https://t.co/HzDDcsBXQ6
How much damage could a cosmic ray do to a human?
#AskEthan
Cosmic rays come in all varieties of energy and speed, with the most energetic ones outstripping even LHC protons by a factor of millions.
What would happen if one hit you?
https://t.co/h70DcuAvWI
Where are all the blueshifted galaxies?
#AskEthan
The Universe is expanding, sure.
Nearby, many galaxies are blueshifted, far away, few are, and beyond a certain distances, none are.
What does this imply, and how do we know?
https://t.co/dWF6D1MBiQ
Why do gravitational lenses make crosses, not rings?
#AskEthan
When an observer, foreground mass, and a background light source all align, you get a gravitational lens.
You might expect Einstein rings, but more often you get crosses.
Here's why.
https://t.co/SbzkQjDVgS
What does “gravitationally bound” mean in the expanding Universe?
#AskEthan
Does the fabric of space expand, within the expanding Universe, in the location where you are?
It depends on if you're inside a bound structure or not. Here's what that means.
https://t.co/sqsyHH1Jl9
Why is there no such thing as antigravity?
#AskEthan
In our Universe, everything that we know of experiences the influence of gravity.
But if there are antiparticles, why isn't there any antigravity?
https://t.co/Hb1PFWBfYN
Why does something exist instead of nothing?
#AskEthan
We all know that the fact that the Universe exists has made a lot of people angry since the dawn of people.
But how did our Universe come to have "something" instead of nothing?
https://t.co/lmLWhTIKok
Can stars form within the expanding Universe?
#AskEthan
The Universe, since the Big Bang, expands, cools, and gets less dense.
How is it possible for gravity to form stars in such a dilute environment?
https://t.co/7wbVWI3qat
How do LLMs/chatbots impact students and cheating?
#AskEthan
Across all educational levels, students are outsourcing their assignments to LLMs like ChatGPT.
Except for the ones who care about growing their own minds, they're unlikely to stop.
https://t.co/1ZI3CQAeA5
Can we ever observe a proton decaying?
#AskEthan
As far as we experimentally know, the proton is a truly stable particle.
But theoretically, there are many motivations to search for proton decay.
Will we ever observe one in action?
https://t.co/KBS8oDHc9P
What’s the point of exploring the Universe?
#AskEthan
With so much going on in the world and so many problems to solve, why should we be investing in exploring the Universe?
We must always remember.
https://t.co/8zipqXGtvu
Is there really a “dark side” of the Moon?
#AskEthan
The phrase "dark side of the Moon" used to refer to the Moon's unseen, away-facing side: the far side.
But there is a "dark side" after all, just not where you'd expect.
https://t.co/iNVG0iaQII
How can we better measure G, the gravitational constant?
#AskEthan
The universal gravitational constant, G, is one of the oldest fundamental constant of all, and yet, one of the least well-measured.
Can measuring it from space help?
https://t.co/fDXrjzarwA
Can Weber bars detect gravitational waves?
#AskEthan
Starting with 2015's first gravitational wave detection, LIGO/Virgo/KAGRA have now seen hundreds of gravitational waves.
Could the original detector design, Weber bars, work today?
https://t.co/74nY7smMI2
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