Deborah Byrd
First quarter moon, juxtaposed with a telescopic view of the moon at this phase.

1st quarter moon is September 24

The 1st quarter moon happens on September 24, 2020, at 01:54 UTC. That’s September 23 for U.S. time zones. Here’s what to look for, and how to recognize this moon phase.

Satellite map showing route of ascent of Mount Everest, from the Nepalese side.

Satellite data helps climbers ascend Mt. Everest

Data from ESA’s Copernicus Sentinel-2 satellite help climbers negotiate a treacherous glacier on the route to Mt. Everest’s summit.

Cool new Hubble portrait of Jupiter’s storms

A beautiful new image of Jupiter from the Hubble Space Telescope – captured in August 2020 – shows the planet’s icy moon Europa as well as several famous storms in Jupiter’s atmosphere.

A woman standing on an ocean pier, throwing a net toward a red sun in a red sky.

September equinox: All you need to know

The equinox is September 22.

What’s the youngest moon you can see with your eye alone?

It has long been a sport for skywatchers to spot the youngest possible crescent moon after sunset, with the eye alone. What does it take to see a very young moon? Details here.

Zodiacal light: All you need to know

The zodiacal light is an eerie light extending up from the horizon before true dawn begins. Southern Hemisphere? Look after sunset!

Earth’s glaciers and ice sheets are melting

Several new studies released in recent weeks paint a dire picture of the ongoing melting of Earth’s freshwater ice sheets and glaciers, 99% of which are found in Greenland and Antarctica.

Here are 2 easy ways to find the Andromeda galaxy

The Andromeda galaxy is the closest big galaxy to our Milky Way. Here are 2 different ways to find it, both easy if you have a dark sky!

New moon is September 17, 2020

New moons generally can’t be seen. They cross the sky with the sun during the day. This month’s new moon happens on September 17, 2020, at 11:00 UTC.

At the edge of the blast

A detailed view of a section of the Cygnus Loop supernova remnant, from NASA.