The density of rock is ~ g/cm3. The density of iron is ~8 g/cm3. The density of terrestrial planets is. ~5 g/cm3. Given this information, what are terrestrial. Mercury's orbital and rotation periods are in a unique resonance; Mercury is the planet closest to the Sun in our solar system and is a member of the family. Mercury's eccentric orbit takes the small planet as close as. 47 million kilometers (29 million miles) and as far as 70 million kilometers (43 million miles) from the.
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The small and rocky planet MERCURY is the closest planet to the. Sun; it speeds around the Sun in a wildly elliptical (non-circular) orbit that takes it as close as. PDF | The planet closest to the Sun, Mercury, is the subject of renewed attention among planetary scientists, as two major space missions will. Planets and their moons and ring systems. • Terrestrial planets: Mercury, Venus, Earth, Mars. • Jovian planets: Jupiter, Saturn, Uranus, Neptune.
Including these large moons, 24 of Saturn's moons are regular, and traditionally named after Titans or other figures associated with the mythological Saturn. The remaining 38, all small, are irregular, and classified by their orbital characteristics into Inuit , Norse , and Gallic groups, and their names are chosen from the corresponding mythologies.
The rings of Saturn are made up of icy objects ranging in size from one centimetre to hundreds of metres, each of which is on its own orbit about the planet. Thus a precise number of Saturnian moons cannot be given, as there is no objective boundary between the countless small anonymous objects that form Saturn's ring system and the larger objects that have been named as moons.
At least " moonlets " embedded in the rings have been detected by the disturbance they create in the surrounding ring material, though this is thought to be only a small sample of the total population of such objects. Uranus has 27 named moons , five of which are massive enough to have achieved hydrostatic equilibrium. There are another 13 inner moons that orbit within Uranus's ring system , and another nine outer irregular moons.
Unlike most planetary moons, which are named from antiquity, all the moons of Uranus are named after characters from the works of Shakespeare and Alexander Pope 's work The Rape of the Lock. Neptune has 14 moons ; the largest, Triton , accounts for more than Triton is large enough to have achieved hydrostatic equilibrium, but, uniquely for a large moon, has a retrograde orbit, suggesting it was a dwarf planet that was captured.
Neptune also has seven known inner regular satellites, and six outer irregular satellites. Pluto , a dwarf planet , has five moons.
Its largest moon Charon , named after the ferryman who took souls across the River Styx , is more than half as large as Pluto itself, and large enough to orbit a point outside Pluto's surface.
In effect, each orbits the other, forming a binary system informally referred to as a double-dwarf-planet.
Eris has one known moon, Dysnomia. As of October , asteroid moons  and 63 trans-Neptunian moons had been discovered. The surface looks similar to the moon — rocks and craters. I don't think life could exist on Mercury.
I don't think we would even want to visit it! Is Mercury hot or cold inside the planet?
This is a hard question. It isn't easy to measure the temperature of the inside of a planet far away in our solar system! We think that Mercury has a molten core, so that would mean that it is hot inside.
The reason we think this is that the spacecraft Mariner 10 found that Mercury has a magnetic field, similar to Earth's but not as strong.
We think that Earth's magnetic field is due to its molten core, so that means that Mercury's must also be due to a molten core. Does Mercury have rings or any moons around it? No, Mercury doesn't have either rings or moons.
Neither does Venus! I think that this is because the planets are fairly close to the sun, and the sun's strong gravity would interfere with anything in orbit around those two planets.
Good question! ALL the other planets have moons and some have rings! When Mercury is directly in line with the sun and Earth, will it affect us on Earth? Mercury is so small with respect to the sun that no one would notice Mercury's tiny shadow. Do Mercury and Venus ever get between Earth and the sun?
If so, what is it called? Yes, this happens — it is called a "transit. A transit of Mercury happens about 13 times in years.