Man, now Pluto is a "Dwarf Planet". It's 33 degrees above Absolute Zero, the sun looks like a christmas tree light, it is so far away and the atmosphere is frozen on the surface for 180 years at a time, sounds like Buffalo to me. Arrogant Astronomers. If there are Plutonians, in 4 months (the time it takes light and radio waves to get there from earth) they are going to be pissed and I would say "Steamed", but I don't think that would suit them. Earth shouldn't be a planet either. A planet doesn't have balding apes with plasma TV's ruining the surface.

No, the moon cannot be a planet, it's orbital pivit point is at the center of the earth. Also, having a planet that is 33 degrees above Absolute zero is cool. And about "Xena", it is also considered a "dwarf", unlike the very tall Kiwi actress, Lucy Lawless. I just wanted to keep Pluto a planet because it is just so wacky...frozen atmosphere on the surface, odd red color, colder than a snake's belly in Wisconsin in January. I know they had scientific reasons for doing what they did, and I am a scientist as well, but it's like someone took the magic away from a really awesome place. And the IAU is also known for its intellectual snobbery.

Didn't know it only took 8.7 hours for light to get there. My degree is in Archaeology. I guess I look at the ground too much. Thanks for the info! I love Astronomy, but have little time for it....or much else this time of year.

Nope. Radio waves are just a very low-frequency version of light waves. They're both part of the electromagnetic spectrum: http://en.wikipedia.org/wiki/Electromagnetic_spectrum

Sound is propagated with pressure waves through some medium (eg air, water, etc). Light/EM waves need no such medium.