Space

Astronomy

Ordinary matter: Lost and found

Astronomers believe they have finally found the whereabouts of most of the ordinary matter in the universe.

Astronomy

Astronomers get radio protection

Astronomers studying the universe at millimeter-wave energies-the high-frequency portion of the radio spectrum-were given an official guarantee last month that commercial satellites and other communication devices won't interfere with the scientists' observations.

Astronomy

The smashup that rejuvenates

For some elderly stars, the fountain of youth may be only a collision away.

Astronomy

Death of a pioneer

Pioneer 10, the first spacecraft to reach the fringes of the solar system, appears to have sent its last feeble signal to Earth on Jan. 22.

Astronomy

Cosmic Doomsday Scenario: Phantom energy would trigger the Big Rip

According to a new model, the universe may end with a Big Rip—every galaxy, star, planet, molecule, and atom torn asunder and the cosmos ceasing to exist some 21 billion years from now.

Astronomy

Dead stars may masquerade as ingenues

A heavenly deception in which dead stars lie about their ages could throw into disarray theories describing some of the densest objects in the cosmos.

Astronomy

Mature Before Their Time

Some galaxies were in place and forming stars at a prolific rate when the universe, now 13.7 billion years old, was just an 800-million-year-old whippersnapper.

Planetary Science

Martian Gullies: Carved by melting snow?

Melting snow may have sculpted the recently formed gullies found at midlatitudes on Mars.

Planetary Science

Space Class

If you’re looking for classroom materials tied to recent NASA news reports, such as evidence suggesting the presence of water on Mars, this Web site pulls together a variety of articles, images, and Web links related to any given report. The archive includes topics such as solar storms, meteors, planetary alignments, eclipses, and many others. […]

Astronomy

Gamma-ray craft plunges into Pacific

As planned, NASA's Compton Gamma Ray Observatory, which had detected some of the highest-energy radiation in the universe for 9 years, crashed into the Pacific Ocean on June 4.

Astronomy

Stars’ wobbles reveal six more planets

Swiss astronomers have found indirect evidence of six additional planets that lie outside the solar system, bringing the tally to more than 40.

Astronomy

Cosmic Revelations: Satellite homes in on the infant universe

A new portrait of the infant universe pins down the age of the universe—13.7 billion years—to an unprecedented accuracy of 1 percent, provides new evidence that the universe began with a brief but humongous growth spurt, and reveals that it already contained a plethora of stars when it was just 200 million years old.