1161–1180 of 1,211 results

Astronomy & Observing News

Mars Odyssey Arrives

An artist's depiction of the 2001 Mars Odyssey spacecraft firing its engine upon reaching Mars. The brightly colored landscape at upper right represents the surface-composition mapping that will be a major mission objective.Courtesy NASA/JPL. After cruising across 460 million kilometers of interplanetary space over 6½ months, NASA's 2001 Mars Odyssey…

Astronomy & Observing News

Meet Comet Borrelly

Deep Space 1 successfully encounters Comet Borrelly.

Astronomy & Observing News

New Eruption Offers a Taste of Io

A towering new volcano on Io, unknown prior to Galileo's close-range flyby on August 6th, created both a 700-kilometer-wide ring (left) and an umbrella-shaped plume extending to a height of at least 500 km (right). The nearby volcano Tvashtar Patera was unexpectedly dormant during the flyby.Courtesy University of Arizona and…

Astronomy & Observing News

Deep Space 1 Spies Comet

Comet Borrelly, which orbits the Sun every 6.8 years, passed through perihelion on September 14th — just 8 days before Deep Space 1 flew past at close range. Georgia amateur Tim Puckett recorded Borrelly's coma and faint tail a half day later with his 30-centimeter telescope. After weeks of concern…

Astronomy & Observing News

Astronomers Launch Pro-Am "Registry"

Years in development, a new online service allows experienced amateur observers and willing professionals to collaborate on scientific research projects.

Solar System

Cassini Calls on Phoebe

Cassini's first rendezvous with a Saturnian moon was a date to remember.

Astronomy & Observing News

NASA's O'Keefe Details Hubble Plans

NASA administrator Sean O'Keefe tells the American Astronomical Society that he wants to send a robot, rather than Space Shuttle astronauts, to service the Hubble Space Telescope.

Astronomy & Observing News

Did an Impact Trigger the "Great Dying"?

Geoscientists think they've found the site of a giant impact off the Australian coast that nearly wiped out life on Earth 251 million years ago.

Astronomy & Observing News

Far-Flung Planetoid Shatters Distance Record

The discovery of an ice world more than twice as far from the Sun as Pluto may change thinking about how the solar system formed.

Astronomy & Observing News

Whirlwind Weekend of Irish Astronomy

In late September skygazers from across Ireland and the United Kingdom flocked to the 18th-annual Whirlpool Star Party.

Astronomy & Observing News

Downpours on Ancient Mars?

A new computer model suggests that ancient Mars may have been deluged with rain following every major cratering event.

Astronomy & Observing News

Mars Meets the Moon

Although lunar occultations of Mars aren't rare, the red planet loomed large during the dramatic meeting on July 17th.

Astronomy & Observing News

Small Asteroids = Small Threat?

Two researchers argue that stony asteroids fall apart much easier when they slam into Earth's atmosphere — and thus are far less destructive — than previously thought.

Astronomy & Observing News

Nozomi (Finally) Heads for Mars

Japan's first-ever planetary spacecraft should reach Mars in mid-December &$151; but will it be functioning when it gets there?

Astronomy & Observing News

Neptune's Forecast: A Cloudy Summer

Although sunlight barely warms distant Neptune, bright clouds are building in the planet's sunny southern hemisphere.

Astronomy & Observing News

NASA Sets Its Sites on Mars

With a mass of roughly 180 kilograms, NASA's Mars Exploration Rovers will be able to trek up to 100 meters per day during their three-month explorations. Each lander carries a suite of five instruments, collectively called Athena, and an abrasion tool for exposing fresh surfaces on rock faces.Courtesy NASA/JPL. After…

Astronomy & Observing News

Too Few Lunar Meteorites

We find as many chunks of Mars lying on Earth as chunks of the Moon — even though the Moon is closer and loses pieces more easily. Something is amiss.

Astronomy & Observing News

Jupiter's Weather Gets Clearer

During its flyby of Jupiter, the Cassini spacecraft found that Jupiter's weather is far more complex than previously thought.

Astronomy & Observing News

Lunar Flash Doesn't Pan Out

A fresh-looking crater on the Moon seemed to confirm that a bright "impact" on the Moon was seen firsthand in 1953 — but new evidence proves otherwise.

Astronomy & Observing News Polar-Ice Puzzle", "bookmark_label" : "Clicked on Solving Mars's
Polar-Ice Puzzle"}'>

Solving Mars's
Polar-Ice Puzzle

Although scientists have long suspected that the south polar cap of Mars was a giant reservoir of water ice, they've only recently had the evidence to prove it.

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