Starship by SpaceX is a 2-stage, fully reusable space transportation system . It'll carry crew and cargo to Earth orbit, the moon, Mars, and beyond.

A Friday 13th has to fall in a calendar month that starts on a Sunday. In 2021, August 1 is on a Sunday. So August 13 must fall on a Friday!

If we adopted the International Fixed Calendar, we'd have 13 months. And each month would contain a Friday the 13th.

At a press conference August 11, 2021, planetary scientists released new odds on asteroid Bennu and its potential to strike Earth.

Scientists solved the mystery of Jupiter's energy crisis by learning that auroras roast the upper atmosphere of the gas giant planet.

2021 Perseid photos from this year's favorite summertime meteor shower. Thanks to all who are contributing at EarthSky Community Photos!

A rare nova visible to the eye erupted this week in the direction of the constellation Ophiuchus the Serpent Bearer. Look for it soon!

The 2021 IPCC report released August 9, 2021, lays out the stark reality of climate change. Learn where we are headed and what we can do to prepare.

A beautiful week for moon-watching ahead. Look west after sunset. Watch for the young moon, Venus, Spica on August 9 to 13, 2021.

Researchers suggest that Mars' subsurface lakes beneath the south polar ice cap may not actually be lakes after all. The first presumed lakes were discovered in 2018 and 2020, and now radar images from Mars Express reveal even more. But many of them are in locations too cold for even salty water to stay liquid.