NASA sends twin probes to the moon
Source: Agencies |
January 3, 2012, Tuesday
|
Print Edition
Print Edition
NASA kicked off the new year with a pair of probes circling the moon in the latest mission to understand how Earth's closest neighbor formed.
There was no champagne popping in the mission control room at the NASA Jet Propulsion Laboratory when the Grail spacecraft arrived back-to-back over the New Year's weekend, but scientists and engineers celebrated by blowing noisemakers.
"It's a really good feeling to have not one but two of our twins in orbit," project manager David Lehman said on Sunday after the mission was deemed successful.
The action began on New Year's Eve when Grail-A swung over the south pole, fired its engine and braked into orbit around the moon. Not to be outdone, its twin Grail-B executed the same maneuvers on New Year's Day.
The arrivals capped a roundabout journey spanning 3 1/2 months and covering 4.02 million kilometers.
The moon has long been an object of fascination. Galileo spotted mountains and craters when he peered at it through a telescope. Poets and songwriters looked to the moon as a muse.
Even governments wanted a piece of the moon. Since the dawn of the Space Age, more than 100 missions launched by the US, former Soviet Union, Japan, China and India have targeted Earth's companion. NASA flew six Apollo missions that landed 12 men on the lunar surface and brought back more than 362.3 kilograms of rock and soil samples.
Despite all the attention, the moon remains mysterious. Mission chief scientist Maria Zuber of the Massachusetts Institute of Technology said researchers know more about Mars, which is farther away from the Earth, than the moon.
One of the enduring puzzles is its lopsided shape with the far side more hilly than the side that Earth sees. Research published earlier this year suggested that our planet once had two moons that crashed early in the solar system's history and created the moon that graces the sky today.
Scientists expect to learn more about how the celestial body formed using Grail's gravity measurements that will indicate what's below the surface.
Since the washing machine-size Grail probes - short for Gravity Recovery And Interior Laboratory - were squeezed on a small rocket to save on costs, it lengthened the trip and took them 30 times longer to reach the moon than the Apollo astronauts, who took a direct three-day flight.
Previous spacecraft have attempted to study the moon's gravity with mixed success. Grail was expected to give scientists the most detailed maps of the moon's uneven gravitational field and insight into its interior down to the core.
Data collection won't begin until March after the near-identical spacecraft refine their positions and are circling 54.72 kilometers above the surface.
There was no champagne popping in the mission control room at the NASA Jet Propulsion Laboratory when the Grail spacecraft arrived back-to-back over the New Year's weekend, but scientists and engineers celebrated by blowing noisemakers.
"It's a really good feeling to have not one but two of our twins in orbit," project manager David Lehman said on Sunday after the mission was deemed successful.
The action began on New Year's Eve when Grail-A swung over the south pole, fired its engine and braked into orbit around the moon. Not to be outdone, its twin Grail-B executed the same maneuvers on New Year's Day.
The arrivals capped a roundabout journey spanning 3 1/2 months and covering 4.02 million kilometers.
The moon has long been an object of fascination. Galileo spotted mountains and craters when he peered at it through a telescope. Poets and songwriters looked to the moon as a muse.
Even governments wanted a piece of the moon. Since the dawn of the Space Age, more than 100 missions launched by the US, former Soviet Union, Japan, China and India have targeted Earth's companion. NASA flew six Apollo missions that landed 12 men on the lunar surface and brought back more than 362.3 kilograms of rock and soil samples.
Despite all the attention, the moon remains mysterious. Mission chief scientist Maria Zuber of the Massachusetts Institute of Technology said researchers know more about Mars, which is farther away from the Earth, than the moon.
One of the enduring puzzles is its lopsided shape with the far side more hilly than the side that Earth sees. Research published earlier this year suggested that our planet once had two moons that crashed early in the solar system's history and created the moon that graces the sky today.
Scientists expect to learn more about how the celestial body formed using Grail's gravity measurements that will indicate what's below the surface.
Since the washing machine-size Grail probes - short for Gravity Recovery And Interior Laboratory - were squeezed on a small rocket to save on costs, it lengthened the trip and took them 30 times longer to reach the moon than the Apollo astronauts, who took a direct three-day flight.
Previous spacecraft have attempted to study the moon's gravity with mixed success. Grail was expected to give scientists the most detailed maps of the moon's uneven gravitational field and insight into its interior down to the core.
Data collection won't begin until March after the near-identical spacecraft refine their positions and are circling 54.72 kilometers above the surface.
- About Us
- |
- Terms of Use
- |
-
RSS - |
- Privacy Policy
- |
- Contact Us
- |
- Shanghai Call Center: 962288
- |
- Tip-off hotline: 52920043
- 沪ICP证：沪ICP备05050403号-1
- |
- 互联网新闻信息服务许可证：31120180004
- |
- 网络视听许可证：0909346
- |
- 广播电视节目制作许可证：沪字第354号
- |
- 增值电信业务经营许可证：沪B2-20120012
Copyright © 1999- Shanghai Daily. All rights reserved.Preferably viewed with Internet Explorer 8 or newer browsers.
