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Pluto's small size and low mass (see the previous section ) have some astronomers calling it an ``overgrown comet'' instead of a planet and it was recently re-classified as a "dwarf planet" http://home-investments.com/library/the-monuments-of-mars-a-city-on-the-edge-of-forever-5-th-edition. Additional seasonal caps of frost appear in the wintertime. These are made of solid carbon dioxide, also known as "dry ice," which has condensed from carbon dioxide gas in the atmosphere, and in the deepest part of the winter, this frost can extend from the poles to latitudes as low as 45 degrees, or halfway to the equator Will NASA Sample Return Answer Mars Life Questions?: Need for comparision with in situ searches. Stars, however, come in a staggering range of luminosities, spanning ten orders of magnitude ten powers of ten. So the brightest stars are not necessarily the ones closest to Earth. In fact, most of the stars you see in the night sky are of the highly luminous variety, and they lie extraordinarily far away. If most of the stars we see are highly luminous, then surely those stars are common throughout the galaxy ref.: www.pierrelacaze.com. How quickly is the Milky Way giving birth to new stars? In their efforts to answer these complex questions, scientists are figuring out new ways to break down the vast amounts of data they collect. For more teaching categories, including language arts, math, and history, please see the InstructorWeb home page. Astronomy Lessons recommended for teaching elementary education including kindergarten first grade - second grade - third grade - fourth grade - fifth grade - sixth grade - preschool - special education. 1st Grade - 2nd Grade - 3rd Grade - 4th Grade - 5th Grade - 6th Grade - ESL

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