Researchers favor nitrogen ice as the most likely material for the mysterious interstellar object’s composition.
Fragments of a comet likely hit Earth 12,800 years ago, and a little Paleolithic village in Syria might have suffered the impact.
A handful of interstellar objects and long-period comets could have scooped up microorganisms from Earth and carried them to worlds around other stars.
A first look at the chemical composition of the interstellar comet Borisov reveals ingredients that look a lot like those found in solar system comets. That’s not likely to last very long.
A fragment of a comet found hidden inside a meteorite is offering new insights into the dynamics of our young solar system.
A year after the end of the Rosetta mission, the real scientific fun begins.
An unusual feature on comet 67P/Churyumov-Gerasimenko offers insights into cometary origins.
On the way to its demise, the probe intimately viewed a dust-spewing pit and measured close up the gravity field, temperature, and other features of the comet.
Finding out whether just a few or many of this newfound type of rocky object roam deep space should help scientists sort among contrasting scenarios of the solar system's infancy.