Interstellar space isn't just vacuum. It's full of gases, elements, and dust - very thinly spread, to be sure - but the building blocks of stars and planets.

A fireball is an especially bright meteor from space. It can start out icy and burn up entirely in our atmosphere, or rocky ... in which case a meteorite sometimes falls to Earth's surface. This bright fireball blazed over northeastern Mexico on Tuesday, October 6, 2020.

Like so much in the sky, very close approaches of Mars happen in cycles. Become a Mars guru, here.

Every year at this time, people in the Northern Hemisphere witness the legendary Harvest Moon. This year, the Harvest Moon was near fiery Mars! Photos here from the EarthSky Community.

Brilliant Venus, in and of itself, is worth getting up for, but the tantalizingly close encounter of Venus with the bright star Regulus won't happen again for another 8 years. Start watching them now!

Guy Ottewell's insights on today's autumnal equinox.

Poor Capricornus. The early Greek stargazers labeled it as a Sea Goat, but no amount of squinting - or even imagining - can help you see a Goat in this part of the sky. In 2020, Jupiter and Saturn come to the rescue!

Earth will pass between Mars and the sun in October 2020, and the distance between our 2 worlds is now relatively small. And so Mars is very bright now! Thanks to all in the EarthSky Community who captured Mars near the moon this past weekend.

These stunning photos - taken by the talented photographers in our own EarthSky community - are from earlier this month, when the moon was less bright in the evening sky. See the Milky Way - the edgewise view into our own galaxy - plus Jupiter, Saturn and meteors here!

We can't believe it. One of the most popular articles at EarthSky this week is the one asking, will Mars be as big as the moon on August 27? Short answer … no. This hoax has been circulating since 2003.