21–40 of 78 results


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


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.


Ice Giants: Neptune and Uranus

Spot Uranus and Neptune, and relive the original discoveries.

Open All Night

Explore the Night with Bob King

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


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

Explore the Night with Bob King

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

Celestial News & Events

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)


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


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


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

Why is Jupiter's Great Red Spot shrinking?


Jupiter's Not-So-Great Red Spot

Astronomers don't know why Jupiter's iconic Great Red Spot has been gradually shrinking since the 1800s — or why the downsizing has accelerated during the past two years. Update: On May 15th, NASA released newly taken images of the Great Red Spot (at bottom below) to show its declining size…

Celestial Objects to Observe

Uranus and Neptune in 2014

Uranus and Neptune are easy to find with the aid of the charts in this article.


Jupiter Facts: Big, Bright, and Beautiful

The King of Planets reached opposition in the first half of January but it's still big and bright, a captivating sight no matter how you look at it.

Saturn and its rings

Celestial Objects to Observe

Viewing Saturn: The Planet, Rings and Moons

Viewing Saturn is an old favorite for every telescope user. Here's a guide to seeing all that you can see on the ringed planet.