Discover and read the best of Twitter Threads about #blackholefriday
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Are you enjoying our #BlackHoleFriday coverage? Like listening to podcasts? Then grab your headphones and dive into the black-hole-themed podcasts we’ve curated in this thread! 🎧 #BlackHoleFriday
The Small Steps, Giant Leaps podcast interviewed Fiona Harrison, the NuSTAR PI, for the X-ray telescope’s 10th anniversary. She talks about its biggest black hole findings and other cool things we’ve learned over the past decade: go.nasa.gov/3u1B4wo #BlackHoleFriday 
Gravity Assist was the perfect podcast for Jeremy Schnittman to talk about black holes because they’re all about gravity! 🎧 Get some black hole basics and find out what Jeremy hopes we’ll discover someday: go.nasa.gov/3EBoV6f #BlackHoleFriday
Happy #BlackHoleFriday! 🕳
In celebration of these fascinating phenomena, here are some common questions and answers about black holes: a thread 🧵⤵️
In celebration of these fascinating phenomena, here are some common questions and answers about black holes: a thread 🧵⤵️
Q: What is a black hole?
A: A stellar black hole is actually the superdense remains of a very big star that imploded and collapsed in on itself. The pull of gravity there is so strong that not even light escapes their pull, hence why we call them "black" holes!
A: A stellar black hole is actually the superdense remains of a very big star that imploded and collapsed in on itself. The pull of gravity there is so strong that not even light escapes their pull, hence why we call them "black" holes!
Q: Why can't light escape a black hole?
A: Within the event horizon of a black hole, space is curved to the point where all paths that light might take to exit, point back inside. Another way to look at it: the escape velocity is faster than the speed of light.
A: Within the event horizon of a black hole, space is curved to the point where all paths that light might take to exit, point back inside. Another way to look at it: the escape velocity is faster than the speed of light.
It's #BlackHoleFriday! So today, I'm going to tell you about how using a black hole could help us reach one of humanity's greatest aspirations that's only ever seen in sci-fi movies and TV shows: time travel! (Well, *kinda*) A thread:
(GIF credit: jila.colorado.edu/~ajsh/insidebh…)
(GIF credit: jila.colorado.edu/~ajsh/insidebh…)
Special Relativity tells us that, for objects that move really fast (like a spaceship), or ones in a large gravitational field (near a star, or say, a black hole), time moves slower than for objects at rest (for example, on Earth).
And I'm here to tell you that, if you took a spaceship and circled around a black hole, time would move slower for you than, say, your friend back on Earth! We'll calculate a specific example, and factor in the time it takes (and what happens to it!) for a spaceship to get there!
THREAD: Need a break from #BlackFriday, digging @NASA’s #BlackHoleFriday? Perfect, enjoy our Black Hole 101! ☄️
First the basics. A black hole is a region in space where the pulling force of gravity is so strong that light is not able to escape. Because of this, black holes are invisible. Only telescopes with special instruments can help find them.
There are three main types of black holes. The black hole's mass and size determine what kind it is.
