spacetoday.net: space news from around the webin association with SpaceNews


Chandra offers new evidence for dark energy
Posted: Wed, May 19, 2004, 8:47 AM ET (1247 GMT)
Abell 2029 galaxy cluster (CXC) Images from the orbiting Chandra X-Ray Observatory have provided astronomers with new evidence that a mysterious "dark energy" is causing the expansion of the universe to accelerate. Astronomers used Chandra to study 25 distant galaxy clusters at x-ray wavelengths, relying on the property of such clusters to have similar ratios of hot gas — which can be detected by Chandra — to the overall mass of the cluster, to measure the distance to each cluster. Astronomers found that the expansion of the universe first decelerated after the Big Bang, but began to accelerate about six billion years ago. That acceleration is thought to be caused by dark energy, an unexplained phenomenon that acts against gravity. Astronomers studying the Chandra data concluded that 75% of the universe is composed of dark energy, a similar fraction to other studies that relied on observations of distant supernovae.
<<previous article   next article>>
news in brief
Cassini mission ends with a plunge into Saturn's atmosphere
Posted: Sat, Sep 16 9:06 AM ET (1306 GMT)

ESA signs first Ariane 6 launch contract
Posted: Sat, Sep 16 8:54 AM ET (1254 GMT)

Soyuz launches new crew to the ISS
Posted: Sat, Sep 16 8:49 AM ET (1249 GMT)

news links
Thursday, October 19
Spacecom returns to SpaceX to launch 2 satellites
Globes Online — 5:39 am ET (0939 GMT)
Space: Marketing's Final Frontier
AdAge.com — 5:37 am ET (0937 GMT)
US and Luxembourg frame laws for new space race
Financial Times — 5:35 am ET (0935 GMT)


about spacetoday.net   ·   info@spacetoday.net   ·   mailing list