Can someone please tell me which planet has absolutely no atmosphere, and has a very hot atmosphere, and if there could be more than one?
Thanks
2007-06-19 10:57:38 · 9 answers · asked by Alyssa W 1 in Science & Mathematics ➔ Astronomy & Space
Mercury, no atmosphere
Venus, very hot atmosphere
2007-06-19 11:01:08 · answer #1 · answered by Gen•X•er (I love zombies!) 6 · 0⤊ 0⤋
http://pds.jpl.nasa.gov/planets/
Venus' surface temperature by about 400 degrees to over 740 K (hot enough to melt lead). Venus' surface is actually hotter than Mercury's despite being nearly twice as far from the Sun. Temperature variations on Mercury are the most extreme in the solar system ranging from 90 K to 700 K. The temperature on Venus is slightly hotter but very stable. Mercury actually has a very thin atmosphere consisting of atoms blasted off its surface by the solar wind. Because Mercury is so hot, these atoms quickly escape into space. Thus in contrast to the Earth and Venus whose atmospheres are stable, Mercury's atmosphere is constantly being replenished.
Little is known about Pluto's atmosphere, but it probably consists primarily of nitrogen with some carbon monoxide and methane. It is extremely tenuous, the surface pressure being only a few microbars. Pluto's atmosphere may exist as a gas only when Pluto is near its perihelion; for the majority of Pluto's long year, the atmospheric gases are frozen into ice. Near perihelion, it is likely that some of the atmosphere escapes to space perhaps even interacting with Charon. NASA mission planners want to arrive at Pluto while the atmosphere is still unfrozen. So this might be only planet that doesn't have a atmosphere all the time but it is not even a planet as of last year.
hope this helps
http://seds.lpl.arizona.edu/nineplanets/nineplanets/venus.html
2007-06-19 18:00:52 · answer #2 · answered by wendy l 2 · 2⤊ 0⤋
The atmosphere on the surface of the planet Venus consists mostly of carbon dioxide, with a small trace of nitrogen. The planet Venus has a surface pressure about 90 times that of the Earth. Venus bakes under twice as much solar radiation as Earth and reaches temperatures of 895 degrees Fahrenheit (480 degrees Celsius).
Mercury retains only a wisp of an atmosphere (presumed to be helium). The lack of a significant atmosphere allows temperatures to fluctuate from 750 degrees Fahrenheit during the day to minus 320 Fahrenheit at night
2007-06-19 18:30:01 · answer #3 · answered by bacardi and diet 2 · 0⤊ 0⤋
Hi, the planet with no atmosphere is Mercury. The planet with a very hot and dense atmosphere would be Venus.
Venus' atmosphere is so thick and dense that if you were able to stand on the planet you would be crushed by the downward pressure.
2007-06-19 18:10:50 · answer #4 · answered by Dogna M 4 · 0⤊ 0⤋
Venus has a very hot atmosphere. Not sure about the other question, though. I thought that all planets had an atmosphere, even a tenuous one, like Mars. Possibly Pluto - I don't know.
2007-06-19 18:02:22 · answer #5 · answered by langdonrjones 4 · 0⤊ 0⤋
No Atmosphere: Mercury
Hot: Venus
2007-06-19 23:06:01 · answer #6 · answered by Mr. Smith 5 · 0⤊ 0⤋
Hi. All planets have at least some atmosphere, even Mercury has solar wind blowing on it. And maybe even ice at the poles.
2007-06-19 18:01:55 · answer #7 · answered by Cirric 7 · 0⤊ 0⤋
Mercury - almost no atmosphere. Daytime, hot, nightime cold.
Venus - Very thick atmosphere - hot all the time
Earth - you know Earth...
Mars - very thin atmosphere
Jupiter, Saturn, Uranus, Neptune - gas giants
Pluto - Ice ball, very thin atmosphere.
2007-06-19 18:33:18 · answer #8 · answered by quantumclaustrophobe 7 · 0⤊ 1⤋
Mercury.
The side facing the sun is hot, the side not facing the sun is cold.
Mercury doesn't rotate like Earth, so one side is constant day, the other is constant night.
2007-06-19 18:01:13 · answer #9 · answered by Shaggy 4 · 0⤊ 0⤋