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It wont. It's beyond Laniakea, itself not gravitationally bound.

It depends entirely on how fast that something is moving toward the Earth. You only specified a distance, but not a speed.

Oh! Well I'm not sure how fast. I read this article that said a blackhole is facing us and apparently it's a blazer (I don't know what that means I'm knew to space stuff) and it says it was 657 million light years away and I was wondering, if it were to come towards us, how fast it would be, but since I don't know the speed then I'm not much help. Sorry.

If moving at the speed of light (and we’re assuming the movement of the earth is insignificant), it would take, well, 657 million years.

If you didn’t mean light speed travel, we need to know what speed you’re intending.

I meant light travel! Nothing else. Thank you :>

Even if earth and the black hole were heading towards each other at the speed of light (can’t go any faster), it would take hundreds of millions of years to meet in the middle.

Oh, ok! Thank you for answering (and being patient with me for not knowing this stuff)!

Yeah a light year is simply the distance that light travels in a year.

At that distance, cosmic expansion may keep them from ever meeting, even if they kept coming at one another. Space is weird.

Which is ~9.461 trillion kilometres (~5.879 trillion miles)

Yeah just trying to keep things simple

For perspective, any light from earth reaching it today would pre-date essentially all animal life in the history of the planet.

Not accounting for spatial dilation due, of course...

Somewhere between 657 million years and forever.

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