One of the oldest unsolved riddles in planetary science concerns the origin of the moon. Over a century ago, George Darwin ...

Earth, sun, moon: three objects in space whose interactions have a pretty big impact on our lives. Earth orbits the sun once a year, and it rotates on its axis about once a day (depending on your ...

Discover the Moon Phase Today, December 10, 2025. It's a Waning Gibbous (65-68% lit). Learn the 8 phases, lunar cycle, and ...

Apollo samples provide evidence: Researchers analyzed Moon rocks brought back by the Apollo missions and, for the first time, used their iron isotope ratios to trace where Theia originally formed.

Historical observations of the Moon's motion, dating back to ancient civilizations, played a crucial role in the development of timekeeping and calendar systems. The Moon's orbital cycle can be ...

2024 PT5, Earth’s newest mini-moon, is expected to go into orbit of Earth for a couple of months from Sept. 29, 2024. Update, Oct. 9, 2024: A link to a map of asteroid 2024 PT5’s orbit around the sun ...

Visualization of the Sun-Earth Lagrange points. Orbital mechanics is a fun subject, as it involves a lot of seemingly empty space that’s nevertheless full of very real forces, all of which must be ...

2024 PT5 is a near-Earth asteroid and is 11 meters in diameter (artist's impression shows a generic asteroid close to Earth). After just under two months in orbit, it's time to say goodbye to an ...

Hakuto-r captures a rare “terrestrial sunrise” during a total eclipse just before crashing into the Moon, revealing the ...

"A three-body problem is extremely complicated. Now we're dealing with four: the sun, Earth, the moon and Mars. The heavy ...