Myt332 From Australia, joined Sep 2003, 9114 posts, RR: 69 Posted (8 years 9 months 5 days 9 hours ago) and read 2770 times:
Leading astronomers have declared that Pluto is no longer a planet, approving new guidelines that downsize the solar system from nine planets to eight. The International Astronomical Union stripped Pluto of the planetary status it has held since its discovery in 1930.
Nighthawk From UK - Scotland, joined Sep 2001, 5230 posts, RR: 32
Reply 3, posted (8 years 9 months 5 days 9 hours ago) and read 2748 times:
1) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction
2) an object in orbit around a star that is not a star in its own right
Now, pluto is not a star, and it orbits round the sun, so that makes it a planet! Cmon astronomers, google says so, so it must be true!
DesertJets From United States of America, joined Feb 2000, 7842 posts, RR: 14
Reply 12, posted (8 years 9 months 5 days 9 hours ago) and read 2678 times:
Quoting KFLLCFII (Reply 5): Now they're downsizing the solar system to eight??
I think what will eventually happen, especially as more large objects are discovered beyond Neptune, is that some additional classification scheme will be needed for objects like Pluto, Sedna, and 2003 UB313. Size aside, b/c their orbits are often at odd inclinations and are highly eccentric (Sedna for example has an orbital period of 12050(!) years, gets as close as 76 AUs and as far as 975 AUs), they are clearly very different objects in how they came to be and what their role in the solar system is.
Stop drop and roll will not save you in hell. --- seen on a church marque in rural Virginia
Garnetpalmetto From United States of America, joined Oct 2003, 5459 posts, RR: 52
Reply 14, posted (8 years 9 months 5 days 9 hours ago) and read 2669 times:
Quoting Andreas (Reply 4): Hmmm, does that mean that Pluto gets deleted from Gustav Holst's masterpiece "The planets", too???
Pluto was never a movement in "The Planets" as Holst wrote it. The movement "Pluto, the Renewer" was written as an add-on by Colin Matthews in 2000.
From my perspective why not consider it a planet? It may not have "orbital dominance," but Pluto does have three satellites of its own (Charon, Nix, and Hydra) - why not just grandfather it as a planet and be done with it?
South Carolina - too small to be its own country, too big to be a mental asylum.
AerospaceFan From , joined Dec 1969, posts, RR:
Reply 17, posted (8 years 9 months 5 days 9 hours ago) and read 2648 times:
By the way, NASA's New Horizons space probe may become the first and only spacecraft ever to have been launched toward a planet that ended up at a Kuiper Belt Object -- Pluto.
Regardless of that, I look forward to seeing New Horizon reach Pluto in years hence, if for nothing else than nostalgia's sake.
Come to think of it, it may be a greater honor for a spacecraft to visit a Kuiper Belt Object for the very first time -- that, and Charon, another such object, too! After all, visiting planets is so 2006.
CastleIsland From , joined Dec 1969, posts, RR:
Reply 19, posted (8 years 9 months 5 days 9 hours ago) and read 2639 times:
Quoting Garnetpalmetto (Reply 14): From my perspective why not consider it a planet? It may not have "orbital dominance," but Pluto does have three satellites of its own (Charon, Nix, and Hydra) - why not just grandfather it as a planet and be done with it?
Because science is based on models constructed from theory and observation, not sentimentality. Pluto does not fit the model parameters for being a planet. It's not like Pluto is offended.