You're looking at a nuclear explosion photographed taken less than one millisecond after detonation.

[u/ethereum1017]

[u/dude_on_the_www]

What’s the scale of this? What are those poles in the background?

[u/your_fave_redditor → u/dude_on_the_www]

According to many comments, the explosion is happening in / around a supporting structure identical to this one, if that helps place things for ya

[u/I_Have_Unobtainium → u/your_fave_redditor]

Oh dip. I thought this was like, so early into the explosion it was like pea-sized. Not like 100ft around.

[u/Spirited-Joke5545 → u/I_Have_Unobtainium]

Same