how many planets in this universe are their?

There was nine planets before which were Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. In 2006, researches state that Pluto is not a planet . Reason being 1. A planet has to orbit the Sun. Okay fine, Pluto does that. 2. A planet needs enough gravity to pull itself into a sphere. Okay, spherical. Pluto’s fine there too. 3. A planet needs to have cleared out its orbit of other objects. Uh oh, Pluto hasn’t done that. Meaning there is currently eight planets for more about this here are some links that i thought are very useful http://www.universetoday.com/15568/how-many-planets-are-in-the-solar-system/ http://scienceblogs.com/startswithabang/2013/01/05/how-many-planets-are-in-the-universe/ you can also youtube about it

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American Museum of Natural History

Course: American Museum of Natural History > Unit 2

Lesson 1: Planets

Solar System glossary

Google Classroom

asteroids: small rocky or metallic bodies, most of which orbit the Sun between Mars and Jupiter

comets: made of ice and dust, these frozen pieces of leftover planets move in elliptical orbits around the Sun. As they approach it and begin to melt, comets may release glowing tails of dust and gas millions of miles long.

hydrostatic equilibrium: in a star, the balance acheived between the enormous outward pressure of gas heated by fusion and the inward pull of its own gravity.

mass: the amount of matter contained within a given object.

supernova: an explosion that occurs when a high mass star uses up its fuel and is unable to maintain hydrostatic equilibrium

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Kaylee Dalton
Posted 8 years ago. Direct link to Kaylee Dalton's post “it said some worlds had w...”
it said some worlds had water so is their atmosphere composed of water somehow or does the surface have water?
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- kagiriallan0
  Posted 7 years ago. Direct link to kagiriallan0's post “Water is known to arrive ...”
  Water is known to arrive in comets that plummet into planets. Therefore, if a world has water, as well as an atmosphere to make sure the water isn't heated and escapes back into space, then yes, there is water on the surface, usually the polar caps or in the shadows of mountainous regions.
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Jilly Lasdin
Posted 6 years ago. Direct link to Jilly Lasdin's post “How much mass does earth ...”
How much mass does earth have?
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Christal Sanders
Posted 8 years ago. Direct link to Christal Sanders's post “who found out about hydro...”
who found out about hydrostatic equilibrium?
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aiya
Posted 7 years ago. Direct link to aiya's post “how many planets in this ...”
how many planets in this universe are their?
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(1 vote)
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- maselaher
  Posted 7 years ago. Direct link to maselaher's post “There was nine planets be...”
  There was nine planets before which were Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. In 2006, researches state that Pluto is not a planet . Reason being
  1. A planet has to orbit the Sun. Okay fine, Pluto does that.
  2. A planet needs enough gravity to pull itself into a sphere. Okay, spherical. Pluto’s fine there too.
  3. A planet needs to have cleared out its orbit of other objects. Uh oh, Pluto hasn’t done that.
  Meaning there is currently eight planets
  for more about this here are some links that i thought are very useful
  http://www.universetoday.com/15568/how-many-planets-are-in-the-solar-system/
  http://scienceblogs.com/startswithabang/2013/01/05/how-many-planets-are-in-the-universe/
  
  you can also youtube about it
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  (2 votes)
malik.harris
Posted 8 years ago. Direct link to malik.harris's post “what would happen if a co...”
what would happen if a comet hit kelp-er 180
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