Saturn's two-toned moon, Iapetus
view of mars odyssey in orbit
james webb space telescope at work
new space telescope looking at a nebula
barred spiral galaxy ngc 3319

StarDate Radio: October 26 — Ceres

A big hole in the ground has helped scientists piece together the structure of the dwarf planet Ceres. It’s the...More »

StarDate Radio: October 25 — Iapetus

One of the moons of Saturn is two-toned. One hemisphere is bright, while the other is as dark as coal....More »

Stargazing: October 25

The planet Saturn is due south at nightfall and looks like a bright star, well to the right of brighter...More »

Stargazing: October 24

El Nath, “the butting one,” is close to the upper left of the Moon as they climb into view this...More »

StarDate Radio: October 24 — Mars Odyssey

A NASA spacecraft is celebrating a major milestone today: 20 years in orbit around Mars. It’s the longest-operating Mars mission...More »

Stargazing: October 23

Tonight, the bright star Aldebaran, which represents the eye of the bull, rises to the lower right of the Moon....More »

StarDate Radio: October 23 — Moon and Aldebaran

It’s easy to see that the Moon moves across the sky. Compare its position to the background of stars from...More »

StarDate Radio: October 22 — Nightlights

Pictures of Earth’s nightside shot from space show a lot of islands of light — the glow of cities and...More »

Stargazing: October 22

Perseus the hero strides across the northeast on autumn evenings. It is close to the horizon as night falls, and...More »

StarDate Radio: October 21 — Webb Telescope II

James Webb Space Telescope isn’t like any other telescope — in space or on the ground. Its main mirror, which...More »

Stargazing: October 21

The constellations Serpens and Ophiuchus are low in the west and southwest at nightfall. Look for the planet Venus, the...More »

Stargazing: October 20

The constellation Andromeda’s main figure is outlined by two streamers of stars that form a long, skinny V. It is...More »

StarDate Radio: October 20 — Webb Telescope

Hubble Space Telescope has revealed some of the earliest galaxies in the universe — “cities” of stars as they looked...More »

Current Magazine

November-December 2021 cover

In the November/December issue, we take you inside efforts to send robotic probes back to the Moon, and explain why astronomers are looking for odd black holes that might be left over from the birth of the universe. 

Updated 2021 Sky Almanac

Sky Almanac cover

We've updated the digital version of the Almanac, adding new events in space exploration, revising dates for others, and making additional changes to keep it fresh and up to date.

This year offers up some beautiful skywatching treats, including two good lunar eclipses and several planetary conjunctions. You can find all the details on these and many others in our 2021 Sky Almanac. We also tell you about some amazing dead or dying stars—some of them spectacular, all of them fascinating.

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