Hubble Repair Mission Countdown

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NASA Announces Shuttle Prelaunch Events and Countdown Details:

"CAPE CANAVERAL, Fla., May 1 /PRNewswire-USNewswire/ -- News conferences, events and operating hours for the news center at NASA's Kennedy Space Center are set for the upcoming launch of space shuttle Atlantis. The shuttle's STS-125 mission to upgrade the Hubble Space Telescope is scheduled to lift off at 2:01 p.m. EDT on Monday, May 11."

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Galaxy Cluster in Cosmic Free-for-All (NASA, Chandra, 4/28/09)

Galaxy Cluster in Cosmic Free-for-All (NASA, Chandra, 4/28/09)
Originally uploaded by nasa1fan.

This composite image shows the massive galaxy cluster MACSJ0717.5+3745 (MACSJ0717, for short) where four separate galaxy clusters have been involved in a collision, the first time such a phenomenon has been documented. Hot gas is shown in an image from NASA's Chandra X-ray Observatory and galaxies are shown in an optical image from NASA's Hubble Space Telescope. The hot gas is color-coded to show temperature, where the coolest gas is reddish purple, the hottest gas is blue, and the temperatures in between are purple.

The repeated collisions in MACSJ0717 are caused by a 13-million-light- year-long stream of galaxies, gas, and dark matter – known as a filament -- pouring into a region already full of matter. A collision between gas in two or more clusters causes the hot gas to slow down.

However, the galaxies, which are mainly empty space, do not slow down as much and so they move ahead of the gas. Therefore, the speed and direction of each cluster's motion -- perpendicular to the line of sight -- can be estimated by studying the offset between the average position of the galaxies and the peak in the hot gas.

Learn more:
www.nasa.gov/mission_pages/chandra/multimedia/photo09-031...

Credits: X-ray: NASA/CXC/IfA/C. Ma et al. Optical: NASA/STScI/IfA/C. Ma et al.

p.s. You can see all of our Chandra photos in the Chandra Group in Flickr at: www.flickr.com/groups/chandranasa/ We'd love to have you as a member!

Atlantis Getting Ready for Launch

NASA's Space Shuttle Atlantis to Move to Launch Pad Tuesday:

"CAPE CANAVERAL, Fla., March 25 /PRNewswire-USNewswire/ -- Space shuttle Atlantis is scheduled to roll out to Launch Pad 39A at NASA's Kennedy Space Center in Florida on Tuesday, March 31, as preparations for the STS-125 mission move forward. Atlantis is targeted to lift off May 12 to service NASA's Hubble Space Telescope."