# Neil deGrasse Tyson on Reddit (u/neiltyson)

Part of Scientists on Reddit, researched with Autumn (https://www.autumn.ai) from public sources. Updated 2026-11-07. Interactive version: https://www.autumn.ai/resources/scientists-on-reddit/neil-degrasse-tyson

Neil deGrasse Tyson: Astrophysicist, Hayden Planetarium director.

- Reddit account: [u/neiltyson](https://www.reddit.com/user/neiltyson/) (AMA only)
- How we know it's theirs: [The 2017 r/IAmA AMA, posted from this account](https://www.reddit.com/r/IAmA/comments/631eem/)
- Where they post, in the records we retrieved: r/IAmA (355), r/Art (64), r/askscience (1), r/offbeat (1), r/funny (1), r/television (1)
- Known activity in the posts we found: 2011 to 2019
- Wikipedia: https://en.wikipedia.org/wiki/Neil_deGrasse_Tyson

## Moments

### u/neiltyson in r/IAmA, Nov 13, 2011 · Explains things

Replying to a redditor:

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

> 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.

Full thread: https://www.reddit.com/r/IAmA/comments/mateq/comment/c2zg8gi/ · 3,444 points as of Nov 7, 2026

### u/neiltyson in r/IAmA, Nov 13, 2011 · Explains things

Replying to a redditor:

> What never fails to blow your mind in physics?

> 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 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.
>
> 3) That the space-time structure inside a rotating black hole does not preclude the existence of an entire other universe.
>
> MindBlown x 3

Full thread: https://www.reddit.com/r/IAmA/comments/mateq/comment/c2zg74j/ · 3,457 points as of Nov 7, 2026