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the_fungible_man t1_je45u38 wrote

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

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innertiaworld OP t1_je462cl wrote

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.

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Icy-Conclusion-3500 t1_je46bqe wrote

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.

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innertiaworld OP t1_je46fib wrote

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

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[deleted] t1_je46x7s wrote

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

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OG-Bluntman t1_je47afo wrote

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

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Antimutt t1_je45u0g wrote

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

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Grumpy-Greybeard t1_je4aoyt wrote

Somewhere between 657 million years and forever.

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Icy-Conclusion-3500 t1_je4640g wrote

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.

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space-ModTeam t1_je4bzpw wrote

Hello u/innertiaworld, your submission "Question about Light Years" has been removed from r/space because:

  • Such questions should be asked in the "All space questions" thread stickied at the top of the sub.

Please read the rules in the sidebar and check r/space for duplicate submissions before posting. If you have any questions about this removal please message the r/space moderators. Thank you.

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