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Astronomy Picture of the Day 6-25-03
NASA ^ | 6-25-03 | Robert Nemiroff and Jerry Bonnell

Posted on 06/25/2003 3:12:28 AM PDT by petuniasevan

Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2003 June 25
See Explanation.  Clicking on the picture will download
 the highest resolution version available.

Galaxies in the GOODS
Credit: NASA, ESA, GOODS Team, M. Giavalisco (STScI)

Explanation: This tantalizing view of galaxies scattered near and far is part of the Hubble Space Telescope's contribution to the GOODS - the Great Observatories Origins Deep Survey project. The GOODS' goal is to study galaxy formation and evolution over an unprecedent wide range of cosmic distances, therefore spanning time from the present to the early Universe. Joined by the Chandra X-ray Observatory and soon by the anticipated Space Infrared Telescope Facility along with major ground-based observatories, the project expands greatly on the past Hubble Deep Fields of regions in the northern constellation of Ursa Major and southern constellation Tucana. Across the electromagnetic spectrum, a sample of large nearby galaxies, like the interacting pair at the lower left above, will be compared with distant younger galaxies in a search for clues to the origins of these lighthouses of the cosmos. Preliminary results of the project confirm that the birth rate of stars was higher in the past and that galaxies have indeed been constructed from the "bottom up", growing from mergers and accretion of small infant galaxies to their present day forms.

TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: deepspace; galaxies; galaxy; hubble
SIRTF - Space InfraRed Telescope Facility

The Space InfraRed Telescope Facility (SIRTF) is a space-borne, cryogenically-cooled infrared observatory capable of studying objects ranging from our Solar System to the distant reaches of the Universe. SIRTF is the final element in NASA's Great Observatories Program, and an important scientific and technical cornerstone of the new Astronomical Search for Origins Program.

Launch Date: August 2003
Launch Vehicle/Site: Delta 7920H ELV / Cape Canaveral, Florida
Estimated Lifetime: 2.5 years (minimum); 5+ years (goal)
Orbit: Earth-trailing, Heliocentric
Wavelength Coverage: 3 - 180 microns
Telescope: 85 cm diameter (33.5 Inches), f/12 lightweight Beryllium, cooled to less 5.5 K
Diffraction Limit: 6.5 microns
Science Capabilities: Imaging / Photometry, 3-180 microns
Spectroscopy, 5-40 microns
Spectrophotometry, 50-100 microns
Planetary Tracking: 1 arcsec / sec
Cryogen / Volume: Liquid Helium / 360 liters (95 Gallons)
Launch Mass: 950 kg (2094 lb) [Observatory: 851.5 kg, Cover: 6.0 kg, Helium: 50.4 kg, Nitrogen Propellant: 15.6 kg]

1 posted on 06/25/2003 3:12:28 AM PDT by petuniasevan
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To: MozartLover; Joan912; NovemberCharlie; snowfox; Dawgsquat; viligantcitizen; theDentist; ...

2 posted on 06/25/2003 3:13:30 AM PDT by petuniasevan (My family coat of arms ties in the that normal?)
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To: petuniasevan
Thank you
& good morning
3 posted on 06/25/2003 4:09:43 AM PDT by firewalk
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To: petuniasevan
That's cool.
4 posted on 06/25/2003 6:44:04 AM PDT by foolish-one
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To: petuniasevan
Nice. Thanks for the ping.
5 posted on 06/25/2003 1:00:25 PM PDT by sistergoldenhair (Don't be a sheep. People hate sheep. They eat sheep.)
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To: petuniasevan
Thats cool, but looks VERY busy!!

LOL on your tag line!!
6 posted on 06/25/2003 8:04:06 PM PDT by trussell (Small things occupy small minds. So, thats why dems can play with themselves for hours!!)
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To: petuniasevan

Thank you.
7 posted on 06/25/2003 9:27:24 PM PDT by Soaring Feather (Today is the First Day of the Rest of Your Life!)
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