Earth-crossing Asteroids ppt asteroids powerpoint presentation id6851672 Earth-crossing Asteroids

Earth crossing Asteroids ppt asteroids powerpoint presentation id6851672 Earth crossing Asteroids

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Interesting facts about space.

A billion years ago, our Moon was closer to Earth than it is now. As a result, it appeared to be a much larger object in the sky. During that ancient era, if human beings had been around to witness such a sight, it would have been possible to see the entire Moon--not merely the one near side face that we see now. A billion years ago, it took our Moon only twenty days to orbit our planet, and Earth's own day was considerably shorter--only eighteen hours long. Stupendous, almost unimaginably enormous tides, that were more than a kilometer in height, would ebb and flow every few hours. However, things changed, as the lunar orbit around our primordial planet grew ever wider and wider. Annually, Earth's Moon moves about 1.6 inches farther out into space. Currently, the lunar rate of rotation, as well as the time it takes to circle our planet, are the same.

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But small moons like Methone are usually geologically inactive and bereft of an atmosphere. Therefore, they are usually unable to smooth away the scars. Dr. Peter Thomas of Cornell University in Ithaca, New York, explained it this way in the May 17, 2013 New Scientist: "When we look at objects less than 200 kilometers in radius, they are all like potatoes. They have lumps, grooves, craters." This makes Methone's smooth surface a mystery. Dr. Thomas is a Cassini team member.

and finally

"If there are plumes on Europa, as we now strongly suspect, with the Europa Clipper we will be ready for them," commented Dr. Jim Green in the April 13, 2017 NASA Press Release. Dr. Green is Director of Planetary Science at NASA Headquarters.

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Many people believe that astrology only concerns the sun. This is due to the Western world view of astrology, which has taken on the form of Zodiac horoscopes. However, in truth the study of astrology goes well beyond sun signs.

The Cassini-Huygens mission is a cooperative endeavor by NASA, the European Space Agency (ESA), and the Italian Space Agency. The Jet Propulsion Laboratory (JPL), a division of the California Institute of Technology in Pasadena, California, manages the mission for NASA.

First launched as GRAIL A and GRAIL B in September 2011, the two probes, playfully dubbed Ebb and Flow, operated in an almost-circular orbit near the lunar poles at an altitude of about 34 miles until their mission concluded in December 2012. The distance between the twin probes altered slightly as they flew over areas of lesser or greater gravity that resulted from visible features--such as craters and mountains--as well as by hidden masses secreted beneath our Moon's surface.