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Zeroing in on Hubble's constant

Pasadena, CA— In the early part of the 20th Century, Carnegie astronomer Edwin Hubble discovered that the universe is expanding. The rate of expansion is known as the Hubble constant. Its precise value has been hotly debated for all of the 80 intervening years. The value of the Hubble constant is a key ingredient in determining the age and size of the universe. In 2001, as part of the Hubble Space Telescope Key Project, a team of astronomers led by Carnegie's Wendy Freedman determined precision distances to individual far-off galaxies and used them to determine that the universe is expanding at the rate of 72 kilometers per second per megaparsec. While the debate had previously raged over a factor-of-two uncertainty in the Hubble constant, Freedman and her team cut that uncertainty down to just 10%.

Atlantis shuttle to service Hubble telescope in May

The US space agency has set a tentative date of May 12 for the lift-off of the Atlantis space shuttle, on a long-delayed service mission to the Hubble telescope, NASA announced. The original launch, scheduled for October, was put off after a unit that collects, formats and sends data back to the ground from Hubble failed. “Since then, engineers have been working to prepare a spare. They expect to be able to ship the spare, known as the Science Instrument Command and Data Handling System, to NASA’s Kennedy Space Centre in Florida in spring 2009,” NASA said in a statement sent out late Thursday. The flight of Atlantis shuttle STS-125 to Hubble will be the last to service the aging telescope, which is due to be replaced in 2013 by a highly sophisticated space telescope with an eagle-eye camera.

Hubble Sees a Celestial 'Snow Globe'

Hubble catches an instantaneous glimpse of many hundreds of thousands of stars moving about in the globular cluster M13. Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

Hubble catches Jupiter's largest moon going to the dark side

NASA's Hubble Space Telescope caught Jupiter's moon Ganymede playing a game of "peek-a-boo." In this crisp Hubble image, Ganymede is about to duck behind the giant planet.

Hubble Catches Jupiter's Largest Moon Going to the 'Dark Side'

NASA's Hubble Space Telescope has caught Jupiter's moon Ganymede playing a game of "peek-a-boo." In this crisp Hubble image, Ganymede is shown just before it ducks behind the giant planet. This color photo was made from three images taken on April 9, 2007, with the Wide Field Planetary Camera 2 in red, green, and blue filters. The image shows Jupiter and Ganymede in close to natural colors.

Hubble Catches Jupiter's Largest Moon Going to the 'Dark Side'

NASA's Hubble Space Telescope has caught Jupiter's moon Ganymede playing a game of "peek-a-boo." In this crisp Hubble image, Ganymede is shown just before it ducks behind the giant planet. This color photo was made from three images taken on April 9, 2007, with the Wide Field Planetary Camera 2.

Hubble Catches Jupiter's Largest Moon Going To The 'Dark Side'

NASA's Hubble Space Telescope has caught Jupiter's moon Ganymede playing a game of "peek-a-boo." In this crisp Hubble image, Ganymede is shown just before it ducks behind the giant planet.

Hubble, Ganymede Play Cosmic Peek-A-Boo

NASA's Hubble Space Telescope has caught Jupiter's moon, Ganymede, playing a game of "peek-a-boo." In this crisp Hubble image, Ganymede is shown just before it ducks behind the giant planet.

Hubble Space Telescope Advent Calendar 2008

krou writes "The Big Picture blog is running a Hubble Space Telescope imagery Advent Calendar, where for the 25 days (it started on the 1st of December), a new photo will be revealed from the Hubble Space Telescope."

Hubble telescope to get final tune-up before being replaced

NASA is all set to for the fifth and final service mission to the Hubble Space Telescope, which is scheduled for May 12 this year.hubby-telescope-300x300 Hubble telescope to get final tune-up before being replaced

Stellar Hubble pics '08

It's been quite a year for Hubble! New galaxies, colliding stars and more... Check out the magnificent views through NASA's Hubble Space Telescope, released in 2008.

Edwin Hubble

During the past 100 years, astronomers have discovered quasars, pulsars, black holes and planets orbiting distant suns. But all these pale next to the discoveries Edwin Hubble (1889-1953) made in a few remarkable years in the 1920s. At the time, most of his colleagues believed the Milky Way galaxy, a swirling collection of stars a few hundred thousand light-years across, made up the entire cosmos. But peering deep into space from the chilly summit of Mount Wilson, in Southern California, Hubble realized that the Milky Way is just one of millions of galaxies that dot an incomparably larger setting.

Launch date set for Hubble servicing mission

Astronauts prepare to install the Near Infrared Camera and Multi-Object Spectrograph (NICMOS) during the second servicing mission to the Hubble Space Telescope in February 1997. The image was taken with Hubble's Wide Field and Planetary Camera 2. It was then manipulated by Scott Kahler who used Adobe Photoshop to create the 3-D image. NASA / STScI / Scott Kahler [View Larger Image]

NASA says shuttle to service Hubble telescope in May (AFP)

An artist's concept released on November 13, 2008 of the Jupiter-type planet that the Hubble Space Telescope observed. The US space agency has set a tentative date of May 12 for the liftoff of the Atlantis space shuttle, on a long-delayed service mission to the Hubble, NASA announced.

Mars orbiter completes primary mission

NASA's Hubble Space Telescope took this close-up of the red planet Mars when it was just 55 million miles (88 million kilometers) away on December 17, 2007. Mars will be at its brightest on December 24, 2007 as it aligns directly opposite of the sun, and will not be as visible for another nine years. This color image was assembled from a series of exposures taken within 36 hours of the Mars closest approach with Hubble's Wide Field and Planetary Camera 2. (UPI Photo/NASA/ESA/Hubble Heritage Team)

Hubble telescope finds carbon dioxide on extrasolar planet

Hubble Space Telescope has discovered carbon dioxide in the atmosphere of a planet orbiting another star, the U.S. space agency NASA reported on Tuesday.

Hubble telescope finds carbon dioxida on extrasolar planet

Hubble Space Telescope has discovered carbon dioxide in the atmosphere of a planet orbiting another star, the U.S. space agency NASA reported on Tuesday.

Hubble Finds Carbon Dioxide on an Extrasolar Planet

HUBBLE SPACE TELESCOPE, NEAR INFRARED AND MULTI-OBJECT SPECTROMETER, EXOPLANET HD 189733B, EXTRASOLAR PLANET HD 189733B, CARBON DIOXIDE ATMOSPHERE, CHEMICAL BIOTRACERS

Hubble Finds Carbon Dioxide on Extrasolar Planet

The Hubble Space Telescope has detected carbon dioxide in the atmosphere of a planet outside of the solar system, a significant step in the search for extraterrestrial life.

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