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Latest Terrestrial planets Stories

2011-04-08 11:54:47

New analysis of images taken by ESA's Venus Express orbiter has revealed surprising details about the remarkable, shape-shifting collar of clouds that swirls around the planet's South Pole. This fast-moving feature is all the more surprising since its center of rotation is typically offset from the geographical pole. The results of this study are published online in Science Express today. Several planets in the Solar System, including Earth, have been found to possess hurricane-like polar...

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2011-04-04 11:34:29

Bombardments of 'micro-meteorites' on Earth and Mars four billion years ago may have caused the planets' climates to cool dramatically, hampering their ability to support life, according to research published today in the journal Geochimica et Cosmochimica Acta. Scientists from Imperial College London studied the effects of the Late Heavy Bombardment (LHB), a period of time in the early Solar System when meteorite showers lasting around 100 million years barraged Earth and Mars. This...

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2011-03-31 05:00:00

NASA released the first batch of hundreds of photos taken by MESSENGER during its orbit of Mercury on Wednesday. The images show numerous battle scars on the planet, which scientists said are from space rocks regularly pelting Mercury at high speeds. MESSENGER's images have revealed a planet full of craters from pieces of asteroids and comets. Mission chief scientists Sean Solomon said scientists are surprised to see more secondary craters than expected. Scientists said that those craters...

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2011-03-15 09:00:33

Scientists are excited about solving some of the mysteries surrounding our smallest and hottest planet; the findings are expected to broaden our understanding of rocky planets, more and more of which are being discovered in other solar systems At 8:45 p.m. EDT on March 17, the MESSENGER spacecraft will execute a 15-minute maneuver that will place it into orbit around Mercury, making it the first craft ever to do so, and initiating a one-year science campaign to understand the innermost...

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2011-03-12 07:10:00

A small NASA spacecraft called Messenger will enter into the orbit of the planet Mercury on St. Patrick 's Day, circling as close as 125 miles from the rocky planet's surface and revealing parts of Mercury never before seen by human eyes. Coincidentally, a few days earlier will be the best time this year for people here on Earth to see Mercury with the naked eye, the Associated Press reported. Despite being the planet closest to the sun, some scientists believe Mercury contains tons of ice in...

2011-02-25 10:24:00

HOUSTON, Feb. 25, 2011 /PRNewswire-USNewswire/ -- Studies of ice processes on Mars and early science results from a Japanese mission to an asteroid will highlight the 42nd annual Lunar and Planetary Science Conference March 7-11 in Houston. (Logo: http://photos.prnewswire.com/prnh/20081007/38461LOGO) The conference will include presentations on these topics and special sessions on observations of last year's flyby of comet Hartley 2 and research on the effects that volatile species...

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2011-02-21 14:15:00

NASA's MESSENGER probe is about set a milestone for spacecraft as it becomes the first probe to orbit Mercury. MESSENGER's team outlined details to scientists at a conference in Washington DC. The spacecraft has already made three flybys of Mercury and is set to enter orbit around the rocky world on March 17. NASA's Mariner 10 spacecraft made several passes of the planet in the 1970s and sent pictures back of what appeared to be an uninteresting planet compared with Venus, Mars and the...

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2011-02-21 09:30:00

New research gives the first accurate estimate of how much faster the Earth's core is rotating compared to the rest of the planet. Previous research had shown that the Earth's core rotates faster than the rest of the planet. However, scientists from the University of Cambridge have discovered that earlier estimates of 1 degree every year were inaccurate and that the core is actually moving much slower than previously believed "“ approximately 1 degree every million years. Their findings...

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2010-12-21 11:45:00

The change of seasons on Earth has been a cause for celebration since time immemorial. Caused by the tilt of Earth's axis relative to its orbital plane around the sun, seasons have profound changes on our weather and climate. When seasons change, nature reacts differently, depending on location. Temperatures change, rain or snow falls, rivers may flood, to name just a few effects. From space, NASA satellites record the change of seasons. Satellite images show large parts of the landscape at...

2010-12-09 17:49:00

MOFFETT FIELD, Calif., Dec. 9, 2010 /PRNewswire-USNewswire/ -- A team of NASA-funded researchers has unveiled a new theory that contends planets gained the final portions of their mass from a limited number of large comet or asteroid impacts more than 4.5 billion years ago. These impacts added less than one percent of the planets' mass. (Logo: http://photos.prnewswire.com/prnh/20081007/38461LOGO) Scientists hope the research not only will provide a better historical picture of the birth...


Latest Terrestrial planets Reference Libraries

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2004-10-19 04:45:42

Terrestrial Planet -- A terrestrial planet is a planet that is mostly composed of silicate rocks and may or may not have a relatively thin atmosphere. The term is derived from the Greek word for Earth, so an alternate definition would be those planets that are more Earth-like than not. Terrestrial planets are very different from gas giants, which may or may not have solid surfaces and are composed mostly of hydrogen and helium in various physical states. Only one terrestrial planet,...

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2004-10-19 04:45:40

The Planet Venus is the second planet from the sun. It is often called the evening star or morning star and is brighter than any object in the sky except the sun and the moon. Because its orbit lies between the sun and the orbit of the earth, Venus passes through phases like those of the moon, varying from a large bright crescent when the planet is near inferior conjunction (nearest the earth) to a smaller silvery disk when it is at superior conjunction (farthest from the earth). Since...

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2004-10-19 04:45:40

The Planet Mercury -- in astronomy, nearest planet to the sun, at a mean distance of 36 million mi (58 million km); its period of revolution is 88 days. Mercury passes through phases similar to those of the moon as it completes each revolution about the sun, although the visible disk varies in size with respect to its distance from the earth. Because its greatest elongation is 28, it is seen only for a short time after sunset or before sunrise. Since observation of Mercury is...

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2004-10-19 04:45:40

The Planet Mars -- in astronomy, 4th planet from the sun, with an orbit next in order beyond that of the earth. Physical Characteristics Mars has a striking red appearance, and in its most favorable position for viewing, when it is opposite the sun, it is twice as bright as Sirius, the brightest star. Mars has a diameter of 4,200 mi (6,800 km), just over half the diameter of the earth, and its mass is only 11% of the earth's mass. The planet has a very thin atmosphere consisting...

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2004-10-19 04:45:40

Earth -- in geology and astronomy, fifth largest planet of the solar system and the only planet definitely known to support life. Gravitational forces have molded the earth, like all celestial bodies, into a spherical shape. However, the earth is not an exact sphere, being slightly flattened at the poles and bulging at the equator. The equatorial diameter is c.7,926 mi (12,760 km) and the polar diameter 7,900 mi (12,720 km); the circumference at the equator is c.24,830 mi (40,000 km)....

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Word of the Day
negawatt
  • A unit of saved energy.
Coined by Amory Lovins, chairman of the Rocky Mountain Institute as a contraction of negative watt on the model of similar compounds like megawatt.