21–40 of 41 results

Planets

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.

Brothers in Blue

Explore the Night with Bob King

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?

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.

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.

Why is Jupiter's Great Red Spot shrinking?

Planets

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…

Jupiter and GRS

Planets

How to See Jupiter: Big, Bright, and Beautiful

Jupiter, the King of Planets, is a captivating sight no matter how you look at it.

Saturn and its rings

Planets

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.

Planets

A Saturn Almanac

Spectacular Saturn is a perennial favorite of telescope users everywhere. Click here to find printable data on the positions of Saturn's rings and planets.

Pro-Am Collaboration

Mercury, Messenger, and Observers

As the first images are released from Messenger's flyby of the innermost planet, previous ground-based observations are proving to be surprisingly accurate.

Celestial Objects to Observe

Catching the Messenger of the Gods

Mercury is a rewarding challenge for planetary astrophotographers, as this amazing image by Massachusetts amateur John Boudreau demonstrates.

Planets

Phenomena of Jupiter's Moons

Virtually any telescope will show Jupiter's four Galilean satellites and their interesting interactions with the planet or its shadow.

Sketch of Jupiter

Planets

Jupiter: The Ultimate Observing Guide

Viewing the solar system¹s largest planet can be more than fun — even with a modest telescope, you can make observations of lasting scientific value.

Planets

The Transit of Venus: Where to See It

For the first time since 1882, Venus will glide across the face of the Sun. Here's where you'll be able to watch this rare event on June 8, 2004.

Celestial Objects to Observe

Venus at Its Best

Venus is readily visible in the evening sky until late May during this most favorable apparition of its eight-year cycle.

Planets

Dust Storm on Mars

A large regional dust storm has enveloped several thousand square kilometers of the red planet and shows no signs of abating.

Celestial Objects to Observe

Mercury Transits the Sun

When this innermost planet passes between the Earth and the Sun on May 7th, it will appear as a tiny black "sunspot" in small telescopes.

Celestial Objects to Observe

Jupiter's Moon Dances

Every six years, for a few months at a time, Jupiter's satellites engage in a wonderful variety of alignments. They're starting up again.

Celestial Objects to Observe

An Observer's Guide to Mars

In 2001 the red planet swung closer to Earth than it had since 1988. It'll be even better in 2003. Here's an observer's guide from the 2001 opposition to whet your appetite for 2003.

Planets

Mercury Transit Tales

Mostly clear skies in Europe, the Far East, and Australia meant that many amateurs were able to view this rare event.

Planets

Viewing Mercury at Its Best

Fast-moving Mercury can be elusive. But spotting this sparkling little planet is easy if you know where and when to look.

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