Category: Space

Geostationary Highway

Posted by Nexus – 21/02/2010

Put a satellite in a circular orbit about 42,000 kilometres from the center of the Earth (36,000 kilometres or so above the surface) and it will orbit once in 24 hours. Because that matches Earth’s rotation period, it is known as a geosynchronous orbit. If that orbit is also in the plane of the equator, the satellite will hang in the sky over a fixed location in a geostationary orbit.

As predicted in the 1940s by futurist Arthur C. Clarke, geostationary orbits are in common use for communication and weather satellites, a scenario now well-known to astroimagers.

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WISE Infrared Andromeda

Posted by Nexus – 20/02/2010

[via APOD]

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This sharp, wide-field view features infrared light from the spiral Andromeda Galaxy (M31). Dust heated by Andromeda’s young stars is shown in yellow and red, while its older population of stars appears as a bluish haze.

The false-color skyscape is a mosaic of images from NASA’s new Wide-field Infrared Survey Explorer (WISE) satellite. With over twice the diameter of our Milky Way, Andromeda is the largest galaxy in the local group. Andromeda’s own satellite galaxies M110 (below) and M32 (above) are also included in the combined fields.

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Dark Shuttle Approaching

Posted by Nexus – 17/02/2010

[via APOD]

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What’s that approaching? Astronauts on board the International Space Station first saw it far in the distance. Soon it enlarged to become a dark silhouette. As it came even closer, the silhouette appeared to be a spaceship. Finally, at just past 11 pm (CST) last Tuesday, the object, revealed to be the Space Shuttle Endeavour, docked as expected with the Earth-orbiting space station.

Pictured above, Endeavour was imaged near Earth’s horizon as it approached, where several layers of the Earth’s atmosphere were visible. Directly behind the shuttle is the mesosphere, which appears blue. The atmospheric layer that appears white is the stratosphere, while the orange layer is Earth’s Troposphere.

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Field of Rosette

Posted by Nexus – 15/02/2010

[via APOD]

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What surrounds the florid Rosette nebula?

To better picture this area of the sky, the famous flowery emission nebula on the far right has been captured recently in a deep and dramatic wide field image that features several other sky highlights.

Designated NGC 2237, the center of the Rosette nebula is populated by the bright blue stars of open cluster NGC 2244, whose winds and energetic light are evacuating the nebula’s center. Below the famous flower, a symbol of Valentine’s Day, is a column of dust and gas that appears like a rose’s stem but extends hundreds of light years.

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Night Launch of the Space Shuttle Endeavour

Posted by Nexus – 09/02/2010

[via APOD]

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Sometimes, the space shuttle launches at night. Pictured above, the space shuttle Endeavour lifted off in yesterday’s early morning hours from Launch Pad 39A in Kennedy Space Center, Florida, USA, bound for the International Space Station (ISS). A night launch, useful for reaching the space station easily during some times of the year, frequently creates vivid launch imagery.

The shuttle, as pictured above, is framed by an enormous but typical exhaust plume ejected as the shuttle’s powerful rockets began lifting the two million kilogram space bus into Earth orbit. Endeavour’s mission, labelled STS-130, includes the delivery of the Tranquility module to the space station.

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A Sun Halo Over Cambodia

Posted by Nexus – 09/02/2010

[via APOD]

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Have you ever seen a halo around the Sun? This fairly common sight occurs when high thin clouds containing millions of tiny ice crystals cover much of the sky. Each ice crystal acts like a miniature lens. Because most of the crystals have a similar elongated hexagonal shape, light entering one crystal face and exiting through the opposing face refracts 22 degrees, which corresponds to the radius of the Sun halo.

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Hong Kong Sky

Posted by Nexus – 07/02/2010

[via APOD]

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This remarkable scene combines multiple exposures recorded on the evening of January 18th from a waterside perspective in Hong Kong, China. It follows a young crescent Moon, with brilliant planet Jupiter to its left, as they set together in the western sky. Their two luminous trails are faintly paralleled by trails of background stars.

But easier to pick out are the short, bright airplane trails converging toward the horizon and the Hong Kong International Airport that seem to offer a frenzied imitation of the celestial tracks. Of course, the reflection of city lights and boat traffic follows the water’s surface. Streaking car lights define the span of the cable-stayed Ting Kau bridge.

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Hubble Detects Mysterious Spaceship-Shaped Object Traveling at 11,000MPH

Posted by Nexus – 03/02/2010

[via gizmodo.com]

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Hubble has discovered a mysterious X-shaped object travelling at 11,000mph. NASA says that P/2010-A2 may be a comet, product of the collision between two asteroids. Or a Klingon Bird of Prey. Either way, UCLA investigator David Jewitt is excited:

“This is quite different from the smooth dust envelopes of normal comets. The filaments are made of dust and gravel, presumably recently thrown out of the nucleus. Some are swept back by radiation pressure from sunlight to create straight dust streaks. Embedded in the filaments are co-moving blobs of dust that likely originated from tiny unseen parent bodies.”

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Mars and a Colorful Lunar Fog Bow

Posted by Nexus – 03/02/2010

[via APOD]

Even from the top of a volcanic crater, this vista was unusual. For one reason, Mars was dazzlingly bright two weeks ago, when this picture was taken, as it was nearing its brightest time of the entire year.

Mars, on the far upper left, is the brightest object in the above picture. The brightness of the red planet peaked last week near when Mars reached opposition, the time when Earth and Mars are closest together in their orbits.

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Intermediate black-hole implicated in star’s death

Posted by Nexus – 03/02/2010

[via discovery.com]

Astronomers presenting at the American Astronomical Society (AAS) meeting in Washington D.C. on Jan. 4, have reported the detection of the emission generated by a black hole as it devoured a white dwarf star in the elliptical galaxy NGC 1399.

This may not appear to be a huge deal to begin with — stars being eaten by supermassive black holes in the centers of galaxies have been detected before — but it would appear that this particular white dwarf was ripped apart and then devoured by a mysterious “intermediate-mass” black hole.

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