Showing posts with label Earth. Show all posts
Showing posts with label Earth. Show all posts

Thursday, August 4, 2011

Earth had two moons, but one was destroyed in giant collision: new theory!

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August 4, 2011 / ANI, London / DC.

Earth had two moons, but one was destroyed in giant collision: new theory

A new theory has come up that the earth might once have had two moons, the one that shines at night today and a smaller companion, which was destroyed in a slow collision between the two satellites.
While the side of the moon facing the Earth has relatively low and flat topography, the side facing away is high and mountainous with a much thicker crust.
Scientists have proposed different theories to explain this lack of symmetry. One leading idea is that gravitational tidal forces reshaped the moon’s crust and made it lopsided.


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Friday, July 29, 2011

'Trojan' asteroid shares Earth's orbit


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PARIS — Earth is not alone in its orbit around the Sun - a small 'Trojan' asteroid sits in front of our planet and leads it, according to British science revue Nature, which published the discovery Thursday.
This diminutive asteroid has a diameter of just 300 metres but is called a Trojan because of its particular position in a stable spot either in front of a planet or behind it. Because the asteroid and planet are constantly on the same orbit, they can never collide.
Jupiter, Mars and Neptune also have Trojan asteroids accompanying them, as do two of Saturn's moons.
NASA scientists discovered the asteroid, which lies 80 million kilometres (50 million miles) from Earth, using its Wide-field Infrared Survey Explorer (WISE) telescope.
Astronomers have long thought that Earth did have some Trojans but their discovery has proved elusive because of the difficulty of seeing them in daylight.
"WISE was a game-changer, giving us a point of view difficult to have at Earth's surface", said Martin Connors, a professor at Canada's Athabasca University and the lead author on the Nature paper on the discovery.


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Saturday, July 23, 2011

TECH VIGILANCE: 'Google Earth can help fight illegal mining in Goa'!

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If used effectively, internet search engine Google's software Google Earth can help pinpoint and curb illegal mining in Goa's hinterland, noted environmentalist Madhav Gadgil said on Wednesday.
Gadgil, a Padma Bhushan awardee, was speaking at the concluding session of a two-day seminar on environment here.
"Mining activity can be monitored easily using the Google Earth software. This is one way you can keep check on it using satellite imagery," Gadgil said.
The veteran green activist and academic said that the marriage of Goa government's unique mapping of the entire state using satellite imagery during the formulation of the state's futuristic Regional Plan 2021, with the clever use of Google Earth could help locate illegal mining as well as excessive mining in existing leases.
"The Regional Plan's mapping shows the area covered by mines and the leases. It should help locate where illegal mining is going on," Gadgil said.



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Tuesday, July 12, 2011

NATIONAL DISASTER: Four earthquakes hit Philippines!

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 Image for representative purpose only - Four earthquakes hit Philippines - via Commons
Image for representative purpose only - Four earthquakes hit Philippines - via Commons.

Four earthquakes with magnitudes ranging from 5 to 6.2 on the Richter Scale hit Philippines early on Tuesday, Xinhua reported.
The tremblors hit Philippines' Negros Occidental province, with the latest taking place at 6.49 a.m. local time with depth of 33.9 km from the ground surface.


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