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Mars, Aldebaran, and the Pleiades in late twilight, Feb. 10, 2023

Celestial News & Events

This Week's Sky at a Glance, February 3 – 12

Comet ZTF is still near its brightest, moonlight and all. Around the Big and Little Dog Stars, trace out the stick-figure patterns of the big and little dogs. A ghostly unicorn haunts the inside of the Winter Triangle.

Comet ZTF (C/2022) and Mt. Etna


Understanding the Tails of Comet ZTF (C/2022 E3)

We explore Comet ZTF's remarkable trio of tails and share the latest news and photos.

Orion and nearby constellations

Sky Tour Astronomy Podcast

February: Winterʼs Dazzling Stars

February 4th marks the midway point between Decemberʼs solstice and the March equinox. Celebrate that celestial milestone by getting outside to gaze in awe at the amazing array of bright stars youʼll find overhead on February evenings.

Comet ZTF E3 dust tail


See Comet ZTF (C/2022 E3) Dash Between Big and Little Dippers

Forget the hype and go outside to enjoy the real thing — a relatively bright comet you can see in binoculars from a dark sky.

Celestial News & Events

This Week's Sky at a Glance, January 27 – February 5

Comet ZTF is at its best this week — but every night moonlight encroaches on the scene until a later and later hour. Along the way, the Moon occults Mars for the southern U.S. and again forms isosceles triangles with naked-eyestars.

2023 BU close approach


Tiny Asteroid 2023 BU to Miss Earth

A recently discovered asteroid will pass exceptionally close to Earth on January 26th. Here's how to see it. Also, Comet ZTF (C/2022 E3) is brightening nicely, with three tails visible in binos.

Crescent Moon passing Venus and Saturn in conjunction, Jan. 22-23, 2023

Celestial News & Events

This Week's Sky at a Glance, January 20 – 29

Venus and Saturn have a close conjunction in twilight. Comet ZTF heads into its best week. And Betelgeuse overtakes Sirius ever earlier in the night.



The Moons of the Solar System

Not so long ago, astronomers thought only a few dozen moons orbited the planets of our solar system. Today, the total count tops 170!

Venus and Saturn at dusk, Jan. 13, 2023,

This Week's Sky At a Glance

This Week's Sky at a Glance, January 13 – 21

Saturn starts the week well above bright Venus in twilight. Watch them close in on each other toward their conjunction on the 22nd. Jupiter and fading Mars shine high. Sirius sparkles below Orion, and binocular Comet ZTF enters its best three weeks.

Alpha Persei Cluster (Melotte 20)

Meet the Stars

Meet Mirfak, the Supergiant of Perseus

Mirfak, the brightest star in the constellation Perseus, is a yellow supergiant star with an uncertain fate.

Cloud map for 2023's annular solar eclipse

Celestial News & Events

Solar and Lunar Eclipses in 2023

Although no total lunar eclipses occur this year, skywatchers can look forward to two “central” solar eclipses — including an annular event in October whose path runs from Oregon through Texas.

Moon crossing Gemini at dusk, Jan. 6-7, 2023

Celestial News & Events

This Week's Sky at a Glance, January 6 – 14

Saturn approaches Venus in twilight, Jupiter and Mars ride high, and Mare Orientale peeks around the edhe of the Moon. And, try exploring the many double stars in Orion's Sword.

Winter Pair-a-gon

Double Stars

Explore Double Stars in the "Winter Pair-a-gon"

The Winter Hexagon is not only key to finding six of the season's most prominent constellations but also a gateway to a more than a half-dozen delightful double stars.

Venus and Saturn on Jan 22 2023

Sky Tour Astronomy Podcast

January: Goodbye, Saturn (Hello, Venus)

For those well north of the equator, January’s long nights provide lots of time to enjoy the starry sky — and the stars of winter are spectacular! This month’s celestial highlights include a close pass of Saturn and Venus, a strong meteor shower, and much more. Our fun and factual Sky Tour podcast provides all the details.

Venus and fading Mercury after sunset, Dec. 31, 2022

This Week's Sky At a Glance

This Week's Sky at a Glance, December 30 – January 7

Venus creeps up, Saturn sinks down; in three weeks the two shall meet. The Moon meets Mars Tuesday. Orion comes into his own to rule the winter, and Sirius emerges below him.

Celestial News & Events

The Best Meteor Showers in 2023

The two richest, most reliable annual meteor showers, the Perseids and Geminids, are Moon-free in 2023. Others showers await you too.

Crescent Moon passing Venus and Mercury, Dec. 24-25, 2022

This Week's Sky At a Glance

This Week's Sky at a Glance, December 23 – 31

Venus and Mercury glimmer low in the southwest in twilight. The newborn crescent Moon starts the week with them, then visits Saturn, Jupiter, and Mars as it waxes toward full.

June 2022 planets

Solar System

All Eight Planets Line Up ... Again!

Echoing summer's great arc of planets at dawn, winter presents the full octet again, this time splayed across the evening sky.

Venus, Mercury, crescent Moon at dusk, Dec. 24, 2022

Celestial News & Events

This Week's Sky at a Glance, December 16 – 24

The Pleiades dipper, the House in the Hyades, Mars high but fading, M31 at the zenith, and a celestial string of holiday lights.

Geminid over Tucson


Catch the Geminid Meteor Shower; Plus, Watch RW Cephei Fade

The luminous Geminid meteor shower returns. We also meet a binocular-bright star that may be experiencing Betelgeuse-like convulsions.

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