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So we recently reached our $10K goal. It's hard to put into words the warm gooey feelings that we get from this incredible show of support. It's an incredible help, especially in these uncertain times. 

We promised to make a Q&A video once we reached this goal. That now seems like it's not enough, so we're planning something much cooler (and much more silly) which we'll talk about more later.  Of course we'll also do the Q&A. So reply here with the questions you'd like me (Matt) to (try to) answer. Pretty much anything is fair game . We'll try get through as many as possible.

We'll probably shoot this next week, so anything that's in this thread by shoot day may get answered.

Comments

Anonymous

In "The Geometry of Causality" <a href="https://youtu.be/1YFrISfN7jo?t=1m23s" rel="nofollow noopener" target="_blank">https://youtu.be/1YFrISfN7jo?t=1m23s</a> you talk about a ship that accelerates to half the speed of light. How can those on the ship tell if they reached that speed?

Anonymous

This is a question that has puzzled me for years. Two ships orbit earth. One leaves orbit and lands on earth, remaining there for 20 years before returning to earth orbit. The second ship leaves orbit and heads out into space. Ship two exactly matches the acceleration of ship one as it lands on earth and, at the end of 20 years, returns to earth orbit where the two ships meet. Otherwise, it accelerates at 1 G for the entire trip. According to the principle of equivalence, their clocks should exactly match at the end of the 20 years. But despite the time dilation experienced by the ship that remains in Earth's gravitational field, it SEEMS like the ship that spends a good deal of time traveling close to the speed of light would experience the passage of less time than the ship that is just sitting on Earth. Am I missing something here or do they really experience the same amount of time?

Anonymous

The Schwarzschild radius of Sagittarius A* is larger than our solar system. How long would it take an object to reach the center of Sagittarius A* once it has passed the event horizon (at an almost zero speed). Would the formula for a falling apple on Earth still apply inside the event horizon?

Anonymous

If gravity curves spacetime, affecting all kinds of particles that pass through that region and consequently affecting all kinds of interactions, does that also work on gravity itself? Is gravitational lensing lensing gravitational waves?

mastermazeproductions

What do you think about the current way people get into space? For example, currently all Canadian Astronauts have to go through NASA, a foreign agency, in order to go to space. Do you think space technology, and the economic/political systems supporting it, will ever get to a point where the richest nations will no longer act as gatekeepers to the cosmos?

Anonymous

How does a black hole not violate the exclusion principle that a Plank-scale 3D coordinate can only be occupied by a single particle?

Anonymous

Is the expansion of the universe caused by the increase of entropy of the entire universe? Should this reflect in the equations of general relativity?

Anonymous

The neutron has a very small mass but they're so many of them. How much of the total matter in the universe is made up of neutrons?

Anonymous

Will the energy of all the existing neutrinos ever be turned into something (regular matter) that the existing regular matter can (really) interact with or is their energy stuck in neutrino form forever?

Anonymous

What does it specifically mean that the equations "break down" at the black hole singularity?

Anonymous

Light travels slower in a medium. Do neutrinos count as a medium? What would the speed of speed of light be if there were no neutrinos in the universe?

Anonymous

Does the light coming from the Sun interact in any way with the cosmic background radiation?