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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

The National Oceanic and Atmospheric Administration's website explains that the tilt in the earth's axis means that during different times of the year, different parts of the earth are pointed toward the sun, resulting i... More »

www.reference.com Science Time & Calendars
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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

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

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 is a dwarf planet in the area of the Kuiper belt, which is an area with many dwarf planets, according to the National Aeronautics and Space Administration (NASA). The dwarf planet is after Neptune in the planetary ... More »

www.reference.com Science Astronomy Planets