Astronomers are a step closer to cracking one of the secrets of dark energy—the mysterious force believed to be causing the universe's accelerated expansion.

The comet is the third object ever confirmed to have entered our cosmic neighborhood from elsewhere in the galaxy. Space ...

Does Thanksgiving with the extended family make you feel like an extraterrestrial landing at the dinner table? You’re not alone. While you can’t choose your family, you can find a new one the pages of ...

Scientists in Boulder are using existing NASA spacecraft to track a rare interstellar comet called 31/ATLAS as it travels ...

XRISM’s Xtend telescope captured the first X-ray image of interstellar comet 3I/ATLAS, revealing a faint X-ray glow and ...

What’s better – many small space missions, or a few large, sweeping ones? Space scientists are asking this question as they ...

The discovery potentially transforms what we think about how the cosmic environment influences galaxies as they form.