Interstellar comets are the original cosmic explorers, and by studying their metallic whispers, we are learning the secrets of worlds we may never see directly.

Passages of the Solar System have only been established in three interstellar objects, but the construction of new telescopes ...

NASA’s SPHEREx telescope spotted interstellar visitor comet 3I/ATLAS flaring up while exiting the solar system. Scientists explain what caused it.

New infrared observations reveal that the rare interstellar visitor known as comet 3I/ATLAS has dramatically brightened ...

Scientists report the first confirmed detection of thiepine, a complex sulfur-bearing molecule, in an interstellar cloud near the Milky Way’s center.

NASA’s TESS spacecraft captured dozens of images of interstellar comet 3I/ATLAS in. The data show the rare visitor behaves ...

NASA's most distant spacecraft had a critical thruster problem far from home. Fixing it required a long-distance call to overcome extreme cold and dwindling power. When you purchase through links on ...

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American In an earlier blog post about Christopher ...

An international team of scientists has examined dust grains gathered by the NASA Stardust spacecraft and brought back to Earth – and has discovered that they originated in the interstellar dust ...

The interstellar visitor may still have a few things to tell us before it leaves our solar system.