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According to National Geographic, the primary reason Pluto was demoted from planet to dwarf planet status is its size relative to its satellite. All the other planets with moons are much larger than their satellites, whi... More »

www.reference.com Science Astronomy Planets

According to NASA, gravity is the reason why planets are round. Gravity causes any matter to attract toward any other matter. When planets began to form, the earth’s solar system was one big swirling disk that contained ... More »

www.reference.com Science Astronomy Planets

Airplanes take longer to fly west than east because of high-altitude winds that blow from west to east. The Earth has four such wind patterns, and they are called jet streams. When planes fly from west to east, the jet s... More »

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Pluto is referred to as a "dwarf planet" because of its location in space and its tiny size, which makes it unable to move other objects out of its orbit. Astronomers began calling Pluto a dwarf planet in 2003 when an as... More »

www.reference.com Science Astronomy Planets

Pluto is not considered a planet due to its small size and location in the solar system. Pluto is considered a dwarf planet, according to NASA. More »

www.reference.com Science Astronomy Planets

In 2006, the International Astronomical Union redefined the criteria for what qualifies as a planet, causing Pluto to lose its designation as such. As of 2014, Pluto is considered one of five dwarf planets, with the othe... More »

www.reference.com Science Astronomy Planets

Pluto experiences four seasons that are determined by the tilt of the planet and its changing distance from the sun due to its eccentric orbit. As Pluto moves towards its furthest point from the sun and its north pole fa... More »

www.reference.com Science Astronomy Planets