An unusual streak of stars thought to have formed in the wake of a wandering supermassive black hole might just be a spiral galaxy seen edge-on.
The Sun has recently experienced an uptick in activity, with lots of sunspots accompanied by flares, coronal mass ejections, and visible auroras — but experts still expect a mild solar cycle.
Where did Earth’s water come from? One of the oldest meteorites on Earth is adding new pieces to an old puzzle.
New measurements from NASA’s Curiosity rover show that methane concentrations near the Martian surface vary on a daily cycle. The finding could help reconcile conflicting data.
Astronomers thought giant stars were reponsible for flooding the early system with a radioative isotope — but the Sun itself might have made it.
Most lunar scientists today think that the Moon formed after a Mars-size body hit the still-forming Earth, launching enough material into orbit to form our satellite. But there is still lively debate about the age of the Moon, and its evolution after it formed. A Mars-size body smashed into Earth…
New Horizon’s flyby of Arrokoth, a planetesimal in the Kuiper Belt, reveals a pristine object untouched since the solar system’s origin. Its shape and geology show that planetesimals form more gently than previously thought.
New research shows that a planetoid impact could have made our Moon asymmetric.
Independent methane detections in the Martian atmosphere by the Curiosity rover and Mars Express orbiter add confusion to a convoluted story.