841–860 of 862 results

Spacecraft and Space Missions

Understanding Saturn's G Ring

Astronomers might have found the source for Saturn's mysterious G ring.

Solar System

Comet Discoverers Awarded

This year's Edgar Wilson Award went to three unique amateur comet discoverers.

Spacecraft and Space Missions

Is a New Moon News?

Thanks to the latest find by the Cassini spacecraft, we now know that Saturn has 60 satellites circling it.

Solar System

The End of the Rovers?

The dust clouds on Mars are blocking out so much sunlight that the Mars Exploration Rovers may not survive until the storm blows over.

Solar System

The Walnut-Shaped Moon

Scientists now think they know why Saturn's moon Iapetus has its distinctive nutty character.

Solar System

Ice Volcanoes Everywhere?

Pluto's largest moon, Charon, might be the latest solar system body with active geysers on its surface.

Solar System

A Ringside View of Uranus

Astronomers have assembled an armada of telescopes to observe Uranus in a way that hasn't been possible since the 1960s.

Spacecraft and Space Missions

Martian Dustup Has an Impact

As a storm rages in Mars's atmosphere, two rovers on the surface and three orbiters above wait for the dust to settle.

Spacecraft and Space Missions

Mars Pole Bound — Again

NASA is set to launch its latest Mars mission, the Phoenix lander, as early as August 3rd.

Spacecraft and Space Missions

Dawn's Liftoff Delayed to September

When delays narrowed the spacecraft's July launch window to just a few days, NASA managers decide to wait two months.

Spacecraft and Space Missions

Let's Hope Dawn Doesn't Break!

When NASA's Dawn spacecraft leaves Earth behind on Sunday, it'll begin an 8-year asteroid-hopping adventure.

Spacecraft and Space Missions

Return of the Sponge Moon

Back in 2005 we reported why Hyperion had a sponge-like appearance. Turns out that our old story is dead wrong!

Solar System

What a Difference a Decade Makes

It's been a decade since Mars Pathfinder touched the surface of Mars and heralded a new era of Martian exploration.

Ceres in cutaway

Solar System

Ceres: The Wet Look

Mounting evidence suggests that the largest asteroid is hiding a large cache of water ice beneath its surface.

ACME Mapper

Solar System

Out of Reach

Some things to look at and think about while this blogger is away.

Weird moon Prometheus

Science-based Q&A

Is there another planet besides Earth whose moon(s) would fit perfectly over the Sun?

It is amazing when you think about the coincidence of the Sun being 400 times bigger than our Moon, yet 400 times farther away, producing an almost perfect fit for a total solar eclipse. Is there another planet whose moon(s) would fit perfectly over the Sun, or are we just…

Centaur 2nd-stage rocket

Solar System

What was the cloud spotted near the western horizon August 31, 2004?

Around 9 p.m. on August 31, 2004, I saw a bright patch of light about half the size of the Moon near the western horizon. It moved slowly upward and fluctuated somewhat in brightness. Through an 8-inch Schmidt-Cassegrain telescope here in New Bloomfield, Pennsylvania, there were two points of light…

Celestial News & Events

Call for Observations: Saturn's Moons

Advanced amateurs with CCD-equipped telescopes are encouraged to measure the "opposition effect" — a brightening expected to occur in the Saturnian system during this upcoming opposition (January 13–14).

Solar System

A New Comet Machholz

Found lurking among the dim stars of the constellation Eridanus, Don Machholz's 10th cometary find will brighten steadily in the months ahead.

Solar System

A Comet's Brush with the Sun

The SOHO spacecraft watched as a comet swung past the Sun.

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