21–40 of 82 results

Celestial News & Events

Venus and Mars Kiss at Dawn

Be sure to set the alarm so you don't miss the squeaky-tight conjunction of Venus and Mars Thursday morning. They'll stay close through the weekend.


Find Jupiter's Moons - Interactive Observing Tool and App

Use our interactive observing tool to say which of the planet's four largest moons is which.

Astronomical Tools

Transit Times of Jupiter's Great Red Spot

Calculate when the Great Red Spot will cross Jupiter's central meridian — that's the best time to see the famous storm through your telescope.

Celestial Objects to Observe

Find Saturn's Moons: Interactive Observing Tool and App

With help from our interactive JavaScript utility, you can always tell which of Saturn's brightest moons is which.

Astronomical Tools

The Elusive Moons of Uranus

Take the observing challenge: Find as many as five of the brightest moons of Uranus in a large backyard telescope using our interactive observing tool.

Celestial Objects to Observe

Track Triton, Neptune's Largest Moon

Triton, Neptune's largest moon, is a tricky find. Our Triton Tracker observing tool can help users of moderate to large telescopes spot this distant moon.


Mars Profiler: Which Side Is Visible?

To compare what you see on Mars with a map, you need to know which side of the planet you're looking at. Our handy Mars Profiler tells you that and more, for any date and time.

Venus over Lake Superior


Watch Venus and Uranus Double Up Beneath a Comet

Following an occultation of Rho Leonis by the Moon, watch Venus and Uranus pair up in a weekend conjunction just 10° from Comet ER61 PanSTARRS.

5th Jupiter flash on record

Solar System

New Impact Flash Seen on Jupiter

Flash! A comet or asteroid fragment whacked Jupiter on May 26th. It's the sixth time that observers on Earth have witnessed an impact on the giant planet.

Brothers in Blue


Uranus: In Seventh Heaven with Planet Seven

With our eyes often glued to the bright classical planets, Uranus is easy to overlook. Now well-placed for viewing at a convenient hour, why not pay this pale blue dot a visit the next clear night?

Visibility zones for Two Occultations

Explore the Night with Bob King

See Two Tricky Occultations — Neptune and Lambda (λ) Aqr

Now you see 'em, now you don't. Watch the Moon occult Neptune and nearby Lambda Aquarii on the same night.

Open All Night

Celestial News & Events

Saturn's Splendid Summer Show

It's showtime for the King of the Rings! Time to get your telescope out to see and share Saturn, which comes to opposition this week.

Big, Bold Mars This Week

Explore the Night with Bob King

Follow Mars to His Double Star Lair

Let Mars be your guide to no fewer than 15 diverse and delightful double stars that pepper its path through Scorpius and Libra this opposition season.

252P Drags its Tail

Explore the Night with Bob King

Up, Up, and Away with Comet 252P

With the Moon finally put to bed and Comet 252P still bright, there's no better time than now to see it. Nearby Mars and Saturn only sweeten the deal.

Solids and Stripes


Jupiter Jumps Back Into The Evening Sky

Jove begins a new apparition with a redder Red Spot, pirouetting moons, and ever-changing cloudscapes.

Paired Together for Another Week

Explore the Night with Bob King

It's Not Over Till The Fast Planet Sinks

This week and early next will be your last chance to see five planets — six if you count Earth — at dawn.

Path of Pluto in 2015 (wide field)

Celestial Objects to Observe

See Pluto in 2015

It’s been a fantastic year for Pluto, and it’s only going to get more so. What better time to make your first (or second!) attempt at spotting the dwarf planet? Read on for a few tips to help you locate this dim object in the summer sky.

Path of Uranus in 2015 (wide field)

Celestial Objects to Observe

Uranus and Neptune in 2015

This article gives directions for finding Uranus and Neptune from June 2015 through March 2016.

Round makes jagged when the light is right

Celestial Objects to Observe

Shadows on the Moon Make a Point

Fooled by shadow play into thinking lunar mountains were pointy pinnacles? Learn why we often see them that way.

View of Saturn through a large backyard telescope

Celestial News & Events

How to See Saturn at Its Best

Your first view of Saturn with a telescope can introduce you to the riches of stargazing — and now is the perfect time to see Saturn and all it has to offer! [caption id="attachment_255423095" align="alignright