Astrophotographer Steven Bellavia captured images of the Bubble nebula in 2018 and 2023. Here, he explains why astrophotographers target the same object twice.
Sun activity for October 3 is moderate, after an eruptive M1.9 flare from AR3455. A filament eruption produced a possibly-Earth-bound coronal mass ejection.
There are many cycles in the heavens. We're coming up to a noticeable cycle - the 2nd eclipse season this year - right now. It starts with a solar eclipse.
After 3 attempts, NASA's Curiosity rover has finally reached a large ridge composed of ancient mud and rocks. The ridge preserves a record of Mars' wet past.
An aurora season occurs in October and March each year, due to the way the magnetic fields of the sun and the Earth work in conjunction with sun-Earth geometry.