Twin siblings, twin peaks, twin cities, twin planets... Two earths, one solar system. How would that work?

The curious minds at What If investigate whether it is possible to fit another Earth in our solar system, revealing orbital ...

Astronomers found an interstellar "tunnel" - a cosmic channel that connects our solar system to distant stars, according to a ...

3I/ATLAS, an interstellar object identified by NASA as a comet, recently passed its closest point to the sun. Scientists around the world are observing its months-long journey to learn more about the ...

CAPE CANAVERAL, Fla. (AP) — NASA unveiled close-up pictures on Wednesday of the interstellar comet that’s making a quick one-and-done tour of the solar system. Discovered over the summer, the comet ...

Add Yahoo as a preferred source to see more of our stories on Google. This photo provided by Gianluca Masi shows the interstellar comet 3I/Atlas as it streaks through space, 190 million miles from ...