- Obit around a Star
- Be sufficiently large that it's self gravity can overcome rigid body forces (it's nearly round).
- Have cleared the area around it's orbit from debris
It is the last bullet point that means Pluto is not a planet.
Source
Posts about interesting things about physics, astronomy, science in general or just things to think about. Just thought it was interesting to think about ...
Showing posts with label Planets. Show all posts
Showing posts with label Planets. Show all posts
Sunday, 4 September 2011
Definition of a Planet
A Planet must...
It is the last bullet point that means Pluto is not a planet.
Source
It is the last bullet point that means Pluto is not a planet.
Source
Tuesday, 12 July 2011
Neptune fact file on it's first birthday
Named after the roman god of the sea.
Mass : 1.0243×10^26 kg
Orbital Period : 164.79 years
Discovered: 164.79 years ago (December 28, 1612) by Urbain Le Verrier bit of argument there though John Couch Adams claimed to have found it also!
Day: 15 hours, 57 minutes and 59 seconds (source)
Atmospheric components: 74% hydrogen, 25% helium, 1% methane
Number of moons: 13
Number of rings: 6
Looks like:
Mass : 1.0243×10^26 kg
Orbital Period : 164.79 years
Discovered: 164.79 years ago (December 28, 1612) by Urbain Le Verrier bit of argument there though John Couch Adams claimed to have found it also!
Day: 15 hours, 57 minutes and 59 seconds (source)
Atmospheric components: 74% hydrogen, 25% helium, 1% methane
Number of moons: 13
Number of rings: 6
Looks like:
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