1141–1160 of 1,207 results

Astronomy & Observing News

The Dim Core of a Stripped Star

A dim, Jupiter-size object orbiting a white dwarf seems to be the last remaining bit of an eroded star's core.Art by Jon Lomberg / Gemini Observatory. Deep in Eridanus is a 17th-magnitude white dwarf that occasionally brightens to magnitude 14.5, as tracked by amateurs in the American Association of Variable…

Observing

Catch the End of the Perseids

It's not too late to catch the tapering-down of the Perseid meteor shower during the nights after its peak.

Astronomy & Observing News

Sedna's Origin Solved?

An artist's conception of the large object, informally named Sedna, discovered last year at more than twice Pluto's distance from the Sun.Courtesy NASA / JPL / Caltech / R. Hurt. Last year astronomers discovered what’s probably the biggest body found in the solar system since Pluto in 1930, and they…

Astronomy & Observing News

Delta Scorpii Brighter Than Ever

A naked-eye star in the dawn continues its unexpected — and very obvious — flareup.

Astronomy & Observing News

A Close Visitor Tumbles By

The little asteroid 1998 WT24, about 1 kilometer wide, was radar-imaged by NASA's Goldstone antenna last week when it flew within five Moon-distances of Earth. Click on image for animated movie of the asteroid's rotation.Courtesy Steve Ostro, Lance Benner, Jon Giorgini (JPL), Jean-Luc Margot (Caltech), and Mike Nolan (Arecibo Observatory).…

Astronomy & Observing News

First Planet of a Giant Star

An artist's concept of a Jupiter-like planet eclipsing the giant star Iota Draconis, which is 13 times larger than the Sun.Courtesy JPL/NASA. About 80 planets are known to orbit main-sequence stars that are more or less like the Sun — ranging from spectral type F (a little hotter and larger…

Astronomy & Observing News

Mars's Active Snow and Ice

These eroded pits in Mars's south polar cap widened noticeably from October 1999 (left) to August 2001 (right). Their walls, several meters high, retreated by about 3 meters during one Martian year. Such rapid change indicates that the material here is frozen carbon dioxide — dry ice — rather than…

Astronomy & Observing News

September 11th Asteroid Memorials

Astronomy and all of science, at their best, embody the finest aspects of the human race — and its grandest hopes for an enlightened future. Guided by such thoughts, a committee of the International Astronomical Union has announced its memorial of the events of September 11th. Sky & Telescope senior…

Astronomy & Observing News

Mars in a Dust Cocoon

The Hubble Space Telescope captured a dramatic change in Mars's weather.Courtesy NASA, James Bell (Cornell University), Michael Wolff (STScI), and the Hubble Heritage Team (STScI/AURA). The dust storm that wiped out Martian surface features in amateur telescopes last July could hardly be more dramatic than in the pair of natural-color…

Astronomy & Observing News

The Heart of Omega Centauri

Left: Some 50,000 stars are individually resolved in a Hubble Space Telescope view through the center of the globular cluster Omega Centauri. Click on the image for a low-resolution view, or here for a full-resolution view. Right: The Hubble frame is only 13 light-years wide, but the entire cluster sprawls…

Astronomy & Observing News

Smoking Gun for Milky Way's Black Hole

Astronomers find conclusive evidence for a black hole in the center of the Milky Way

Astronomy & Observing News

SuperWASP Scrutinizes Swarms of Stars

In a hunt for extrasolar planets, hundreds of thousands of the brightest stars are getting measured precisely many times per night.

Astronomy & Observing News

First Planet Found by Microlensing

Astronomers have detected a Jupiter-mass planet by its gravity's effect on the light from a background star.

Astronomy & Observing News

Astro Image in the News:
No Moon for Sedna

Images from the Hubble Space Telescope reveal that Sedna is solitary and smaller than initially indicated.

Astronomy & Observing News

Redshift Record Smashed Again

Astronomers have used a gravitational lens to view a baby galaxy 96.5 percent of the way back to the Big Bang.

Astronomy & Observing News

New Light on Dark Energy

By measuring distances to the farthest Type Ia supernovae yet, astronomers and getting a sense of how dark energy works.

Astronomy & Observing News

Black Hole Rips Star Apart

A supermassive black hole in a distant galaxy has shredded a star that ventured too close.

Astronomy & Observing News

Opportunity Lands, Spirit Revives

This 360° panorama was assembled from some of the first images beamed to Earth from NASA's Opportunity rover after it landed at Meridiani Planum on Mars.Courtesy NASA/JPL. NASA got a double dose of good news from Mars last night. The Opportunity rover landed successfully on Meridiani Planum and began sending…

Astronomy & Observing News

The Most Massive Star

A luminous blue variable star located some 45,000 light-years away could be the most massive and perhaps the most luminous star ever discovered.

Astronomy & Observing News

More Galaxies that Jump the Gun

Astronomers have found a distant string of galaxies that took shape earlier than current cosmology can explain.

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