2006-08-27 07:17:38 · 13 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
the international astronomical union defined three new terms "classical planet", "dwarf planet", and "small solar system body".
(1) A classical planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighborhood around its orbit.
(2) A dwarf planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, (c) has not cleared the neighborhood around its orbit, and (d) is not a satellite.
(3) All other objects orbiting the Sun shall be referred to collectively as "Small Solar System Bodies".
mercury, venus, earth, mars, jupiter, saturn, uranus, and neptune are "classical planets". ceres, pluto, and 2003 UB313 are three of the "dwarf planets". most seem to be unaware that the term is now "classical planet".
this corrects the mistake of classifying pluto as a planet initially.
look here:
http://www.iau2006.org/mirror/www.iau.org/iau0602/index.html
2006-08-27 07:53:55 · answer #1 · answered by warm soapy water 5 · 3⤊ 0⤋
I agree, who put them in charge of deciding WHAT IS OR IS NOT reality? My children have a CD with songs about our planet on it. "We've Got 9 Planets roamin around the Sun" So. . . .we are now going to rewrite text books and music because they feel like NOT having it a planet anymore. WHY does it need to be changed? Answer: It doesn't.
Wish we could protest the demotion of Pluto!
2006-08-27 17:03:00 · answer #2 · answered by Carrie 4 · 0⤊ 0⤋
Because astromers are dumb enough to think balls of gas without a solid place to ever stand and little chance of life from the cold temperatures and high pressure when there is a somewhat livable temperature, if some (Im looking at you, uranus and neptune...) are more like planets than a solid planet with 3 moons, a perfectly normal composition (not like anything in our solar system, but I heard of super earths in other places that have almost the same composure), and a slight chance of life as well.
2006-08-27 14:58:15 · answer #3 · answered by iam"A"godofsheep 5 · 0⤊ 1⤋
According to the definition recently adopted by the International Astronomical Union (IAU), a planet is a celestial body that
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
(a) is in orbit around a star or stellar remnants;
(b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape;
(c) is not massive enough to initiate thermonuclear fusion of deuterium in its core; and,
(d) has cleared the neighbourhood around its orbit.
According to Wikipedia, condition (d) was not met by Pluto, making it a dwarf planet.
2006-08-27 14:27:06 · answer #4 · answered by Bob 3 · 0⤊ 0⤋
because pluto blew up and in about 7 years it will hit the united states putting a big whole in the earth dont you watch the news
2006-08-27 14:25:55 · answer #5 · answered by pipes1884 2 · 0⤊ 2⤋
because it was to small they also took the 2 new planets out
2006-08-27 14:20:11 · answer #6 · answered by ? 2 · 0⤊ 2⤋
Thank you for asking. We wanted to know too. But I'm still confused.
2006-08-27 18:41:30 · answer #7 · answered by GRANNY12GR1 4 · 0⤊ 0⤋
I am also so sorry for Pluto
poor little planet
2006-08-27 14:20:47 · answer #8 · answered by ZxssxZ 5 · 0⤊ 2⤋
Ah, poor little Pluto, it was my favorite!!
2006-08-27 14:21:28 · answer #9 · answered by Hathor 4 · 2⤊ 1⤋
poor Pluto, we'll miss him
2006-08-27 14:24:20 · answer #10 · answered by ♥ amal_dxb ♥ 3 · 0⤊ 2⤋