The Official Cricketweb Science Thread!

[Spark]

You wouldn't see anything at all. As you approach the event horizon, the entire universe would squeeze to that single point of light behind you, that point of light would become blueshifted below visible, then once you cross the event horizon the whole universe becomes spacelike separated from you and no light from any source can reach you.

 

[silentstriker]

Also it would take you only like 30 seconds to reach the singularity from the moment you cross the event horizon....

 

[Bahnz]

Also it would take you only like 30 seconds to reach the singularity from the moment you cross the event horizon....

Wouldn't it be a bit longer if you fell into a super massive blackhole - though admittedly even in the most extreme cases only a few days.

 

[Bahnz]

I don't think this will ever be a problem tbf. Once you get into a black hole then every physical point of spacetime is spacelike separated from you (kind of the definition of a black hole, mathematically); which is a very technical way of saying that no light from any source whatsoever will ever reach you. You will be in total and complete darkness in perpetuity until you get shredded by tidal forces. By extension Hawking radiation too will only be something you experience outside the event horizon.

As you came right up to the edge of the event horizon would you still be able to turn around and see the entire history of the universe play out in the blink of an eye (I've heard something to this effect in numerous youtube physics docos)?

 

[Victor Ian]

I often wondered whether we can one day see into the past. Given amazing telescopic power is it theoretically possible to catch light rays that have skimmed the edge of a black hole and returned to us?

 

[honestbharani]

Lol... its funny how easily we turn from science to fantasy, isn't it? Guess its a hard to resist temptation.

 

[Victor Ian]

Science fiction, perhaps. Im not asking about elves, or women with swords and big ****.

 

[Spark]

As you came right up to the edge of the event horizon would you still be able to turn around and see the entire history of the universe play out in the blink of an eye (I've heard something to this effect in numerous youtube physics docos)?

Don't quote me on this yet but I don't see how this would be possible.

 

[silentstriker]

Wouldn't it be a bit longer if you fell into a super massive blackhole - though admittedly even in the most extreme cases only a few days.

Even the one at the center of our galaxy, it would take around a minute. For the absolutely biggest ever black holes, yea, you could get to a few days.

 

[silentstriker]

As you came right up to the edge of the event horizon would you still be able to turn around and see the entire history of the universe play out in the blink of an eye (I've heard something to this effect in numerous youtube physics docos)?

Don't quote me on this yet but I don't see how this would be possible.

You'd be able to see the essentially the future of the universe (until your black hole - and you - evaporated). You would simply look back (and stay there) and you'd see the future of the universe play out.

 

[Spark]

Ah I thought he meant the past. Yeah of course you would see years of the future flash before you because of gravitational time dilation.