So this comet was recently discovered, but scientist say it last came 50,000 years ago.
How do we know this?
Thanks in advance!
In: 7
In space there isn’t much to get in the way of something. So a comet will maintain its speed (more or less) indefinitely until it collides with something else. So we can look at the direction of the comet and its speed and calculate how long it would take for it to make one full orbit back to where it is when we look at it now.
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