Planets with low eccentricities have more circular orbits, while planets with a high eccentricities have more elliptical orbits.Planets were assembled out of small "building bodies" called planetesimals, which themselves aggregated from the dust in the solar nebula.Planets and satellites are "built-in", and the program comes with some 7500 asteroids and comets.Planets also have varying degrees of axial tilt; they lie at an angle to the plane of the their stars' equators.Mars.Mars has been known since prehistoric times.Mars has some of the most highly varied and interesting terrain of any of the terrestrial planets, some of it quite spectacular. Olympus Mons. the largest mountain in the Solar System rising 24 km (78,000 ft.Mars has a very thin atmosphere composed mostly of the tiny amount of remaining carbon dioxide (95.Mars is a difficult but rewarding target for an amateur telescope though only for the three or four months each martian year when it is closest to Earth.Mars' thin atmosphere produces a greenhouse effect but it is only enough to raise the surface temperature by 5 degrees (K); much less than what we see on Venus and Earth.Mars' relatively low density compared to the other terrestrial planets indicates that its core probably contains a relatively large fraction of sulfur in addition to iron (iron and iron sulfide).Mars' Satellites Mars has two tiny satellites which orbit very close to the martian surface.Mars remains at the top of the list of possible life-bearing planets.Pluto.Pluto is no longer officially a planet but we'll keep it here for history's sake.Pluto is so far away that the Sun is just a dim point of light that looks a lot like any other star.Pluto was discovered in 1930, four years before Holst's death, and it was hailed by astronomers as a new planet.Pluto Pluto is one of the "dwarf planets" in our solar system.Pluto is part ofa vast population and is rightly classified with that population where it belongs.Pluto, the outermost and smallest planet (although some scientists argue that it shouldn't be considered in this privileged class), is an oddball that doesn't fit easily into either category.Pluto is the largest of the Plutinos, and it and the others only exist where they do because of the dominance of Neptune.Pluto is a "dwarf planet" by the above definition and is recognized as the prototype of a new category of trans-Neptunian objects.Plutons are distinguished from classical planets in that they reside in orbits around the Sun that take longer than 200 years to complete.Planets with the perfect blend of molecular constituents orbiting at just the right distance from the sun enjoy what astronomers call a "Goldilocks" orbit.Planets, as we noted, move relative to the stars, and they do so, generally, moving from west to east in the sky.Planets are much smaller with core temperatures and pressures too low for nuclear fusion to occur.
Sunday, September 9, 2012
Pluto is No Longer Officially a Planet
Planets with low eccentricities have more circular orbits, while planets with a high eccentricities have more elliptical orbits.Planets were assembled out of small "building bodies" called planetesimals, which themselves aggregated from the dust in the solar nebula.Planets and satellites are "built-in", and the program comes with some 7500 asteroids and comets.Planets also have varying degrees of axial tilt; they lie at an angle to the plane of the their stars' equators.Mars.Mars has been known since prehistoric times.Mars has some of the most highly varied and interesting terrain of any of the terrestrial planets, some of it quite spectacular. Olympus Mons. the largest mountain in the Solar System rising 24 km (78,000 ft.Mars has a very thin atmosphere composed mostly of the tiny amount of remaining carbon dioxide (95.Mars is a difficult but rewarding target for an amateur telescope though only for the three or four months each martian year when it is closest to Earth.Mars' thin atmosphere produces a greenhouse effect but it is only enough to raise the surface temperature by 5 degrees (K); much less than what we see on Venus and Earth.Mars' relatively low density compared to the other terrestrial planets indicates that its core probably contains a relatively large fraction of sulfur in addition to iron (iron and iron sulfide).Mars' Satellites Mars has two tiny satellites which orbit very close to the martian surface.Mars remains at the top of the list of possible life-bearing planets.Pluto.Pluto is no longer officially a planet but we'll keep it here for history's sake.Pluto is so far away that the Sun is just a dim point of light that looks a lot like any other star.Pluto was discovered in 1930, four years before Holst's death, and it was hailed by astronomers as a new planet.Pluto Pluto is one of the "dwarf planets" in our solar system.Pluto is part ofa vast population and is rightly classified with that population where it belongs.Pluto, the outermost and smallest planet (although some scientists argue that it shouldn't be considered in this privileged class), is an oddball that doesn't fit easily into either category.Pluto is the largest of the Plutinos, and it and the others only exist where they do because of the dominance of Neptune.Pluto is a "dwarf planet" by the above definition and is recognized as the prototype of a new category of trans-Neptunian objects.Plutons are distinguished from classical planets in that they reside in orbits around the Sun that take longer than 200 years to complete.Planets with the perfect blend of molecular constituents orbiting at just the right distance from the sun enjoy what astronomers call a "Goldilocks" orbit.Planets, as we noted, move relative to the stars, and they do so, generally, moving from west to east in the sky.Planets are much smaller with core temperatures and pressures too low for nuclear fusion to occur.
Subscribe to:
Post Comments (Atom)
0 comments:
Post a Comment