Caso

solar system
mercury
Mercury means:
Mercury was the Roman version of the god Hermes. He was the messenger for the other gods, and for this reason Mercury is often depicted in pictures with winged sandals. In addition to delivering messages, he was also the protector of travelers and merchants.
How much would you weigh on Mercury?
If you moved to Mercury you would not weigh as much as you doon Earth. Not because you would lose weight on the space ship, but because Mercury is smaller, and so has less gravity. If you weigh 70 pounds (32 kg) on Earth, you would weigh only about 27 pounds (12 kg) on Mercury.
The Planet:
Mercury is a world of extremes.  Because it is so close to the Sun a visitor could easily cook to death.  However, because mercury spins so slowly it gets very cold inthe night time, which means a visitor could also freeze to death. 
We are just starting to understand this world.  It looks a lot like our moon, because it has craters and basins.   Scientists used to think it acted like the Moon, but we are now learning that Mercury is in fact very different.  In March of 2011, NASAs Messenger probe entered Mercury's orbit. It will soon give scientists a lot ofnew information about Mercury.
Moons:
Mercury has no moons.
Mercury is so close to the Sun and so small that it has only a very small atmosphere. It has been blown away by the Sun's solar winds. That means that there is almost no air on Mercury.
Mercury |
1 Orbit of Sun | 87.969 Days |
1 Rotation | 58.6461 Days |
Mass | 5% of Earth |
Volume | 5% of Earth |
Escape Velocity | 15,450km/h
(9,600 mph) |
Distance From Sun | 57 million kilometers
(36 million miles) |
Maximum Temperature | 465°C
(870° F) |
Minimum Temperature | -184°C
-300° F |
Atmosphere | Hydrogen, Helium |
Diameter | 4876 kilometers
(3030 Miles) |

Venus means:
Venus was the Roman goddess of love and beauty. In Greek her name was Aphrodite.
How much would you weigh on Venus?
Because Venus andthe Earth are almost the exact same size, you would weigh almost exactly the same on either planet. If you weighed 70 pounds (32 kg) on Earth, you would weigh 63 pounds (29 kg) on Venus.
The Planet:
Venus is a hostile planet.  Its thick cloud cover makes it impossible to see the surface, and traps much of the Sun's heat.   This extra heat gives Venus the hottest average temperature of all theplanets. 
In many ways Venus is similar to the Earth.  It has active volcanoes, venusquakes, mountains and valleys.  The major difference is that Venus' atmosphere makes the planet far too hot for life. 
Moons:
Venus has no moons.
Because Venus and the Earth are the same size, scientists call Venus Earth's sister planet. For a long time most scientists thought that Venus had plants, animals,and possibly even people. However, because Venus is so hot, we now know that it is impossible for anything to live there.
 Orbit of Sun | 224.701 Days |
1 Rotation | 243.16 Days |
Mass | 81% of Earth |
Volume | 86% of Earth |
Escape Velocity | 37,498 km/h
(23,300 mph) |
| |
Distance From Sun | 107 million kilometers
(67 million miles) |
Average Temperature | 449°C
(850° F) |Atmosphere | carbon dioxide, nitrogen, |
Diameter | 12,107 kilometers
(7,523 Miles) |
| |

Jupiter means:Jupiter, known as Zeus in Greece, over threw his father Saturn to become king of the gods. He then split the Universe with his brothers Neptune and Pluto.How much would you weigh on Jupiter?If you traveled to Jupiter on vacation you would be very heavy. If you weigh 70 pounds (32 kg)on the Earth, on Jupiter you would weigh 185 pounds (84 kg).The Planet:Jupiter's great red spot is where a giant storm has been raging for at least 300 years.  Its super hurricane winds blow across an area larger than the Earth. This giant planet has no solid surface.  Under its atmosphere is a large liquid ocean of hydrogen and water.  What lies in between that ocean and the atmosphere? ...