Scientists on Reddit

Neil deGrasse Tyson

Astrophysicist, Hayden Planetarium director

How we know it's theirs

The 2017 r/IAmA AMA, posted from this account

We retrieved 6 posts and 421 comments from u/neiltyson, dated 2011 to 2019, most often in r/IAmA, r/Art and r/askscience.

Best moment

A redditor wrote in r/IAmA

On “I am Neil deGrasse Tyson -- AMA”

Since time slows relative to the speed of light, does this mean that photons are essentially not moving through time at all?

u/neiltyson replied

yes. Precisely. Which means ----- are you seated?

Photons have no ticking time at all, which means, as far as they are concerned, they are absorbed the instant they are emitted, even if the distance traveled is across the universe itself.

More moments

A redditor wrote in r/IAmA

On “I am Neil deGrasse Tyson -- AMA”

What never fails to blow your mind in physics?

u/neiltyson replied

1) The fact that an electron has no known size -- it's smaller than the smallest measurement we have ever made of anything. 2) That Quarks come only in pairs: If you try to separate two of them, the energy…

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The fact that an electron has no known size -- it's smaller than the smallest measurement we have ever made of anything.
That Quarks come only in pairs: If you try to separate two of them, the energy you sink into the system to accomplish this feat is exactly the energy to spontaneously create two more quarks - one to partner with each of those you pulled apart.
That the space-time structure inside a rotating black hole does not preclude the existence of an entire other universe.

MindBlown x 3