space news from around the webin association with SpaceNews

Chandra data bolsters dark matter
Posted: Mon, Oct 28, 2002, 8:09 AM ET (1309 GMT)
Chandra image of NGC 720 dark matter (NASA) Observations of a distant galaxy by the Chandra X-Ray Observatory have offered new support for the dark matter model by providing evidence against an alternative explanation. Chandra observations of NGC 720 showed that the galaxy in enveloped by a cloud of hot gas that is flattened relative to the shape of the galaxy. This flattening cannot be explained by an alternative to dark matter called Modified Newtonian Dynamics, which modifies gravity where forces are very small. The flattening can be explained, though, if the galaxy is surrounded by an egg-shaped halo of dark matter, five to ten times as massive as the galaxy itself. Astronomers believe the dark matter is of the "cold" variety, composed of slowly-moving particles that interaction with normal matter only through gravity.
<<previous article   next article>>
news in brief
Russia plans to resume crewed Soyuz launches in December
Posted: Sun, Nov 4 9:00 AM ET (1400 GMT)

China launches Beidou satellite
Posted: Sun, Nov 4 8:59 AM ET (1359 GMT)

Dawn mission declared over
Posted: Sun, Nov 4 8:58 AM ET (1358 GMT)

news links
Wednesday, November 14
Campus to honor Apollo 8
Tarrant County College District Collegian — 5:17 am ET (1017 GMT)

about   ·   ·   mailing list