Curious Kids: What would happen if someone moved at twice the speed of light?

Seems like this title is just a tease, since the article just ends by "leaving it to your imagination."

I also note that the article says "The farthest star(opens in new tab) we've ever detected is 28 billion light years away. So you can pretty much give up on charting the entire universe."

But that link explains: "When we observe the star’s light, we are looking at light that was emitted from the star 12.9 billion years ago – we call this the lookback time. That is just 900 million years after the Big Bang. But because the universe has also expanded rapidly in the time it took this light to reach us, Earendel is now 28 billion light years away from us."

So, I guess "is" should also reference "if" the universe has continued expanding at the rates we predict it has over the time it took the light to reach Earth.

BTW, exactly how do astronomers get a measurement of the mass of a star after the light has been "lensed" and also distorted by gravitational effects of a mass that is far from a perfect lense?
 

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