Named after: Mercury,
the fast-footed Roman messenger of the gods.
Mean Distance from the Sun: 57,909,175 km (35,983,093.1
miles) or 0.387 astronomical units
Diameter: 4,879.4 km (3,031.92 miles)
0.24 Earth Years (87.97 Earth Days)
Rotation period: 58.65 Earth Days
Atmosphere: Mercury has very little atmosphere. Mercury's thin atmosphere consists of atoms blasted off
its surface by the solar wind, a constant stream of particles coming from the outer layer of the Sun.
Mercury's surface temperatures range from 467 degrees Celsius (872 degrees Fahrenheit) to -183 degrees Celsius (-300 degrees
Fahrenheit). The average surface temperature on Mercury is 166.86 C (332.33° F).
Composition: Rocky planet
with many craters.
My weight on Mercury: 31.374 pounds
Interesting Facts: Scientists
have found water ice inside deep craters at the north and south poles.
after: Roman Goddess known for beauty.
Mean Distance from the Sun: 108,208,930 km. (6.72 x 107
miles) or 0.723 astronomical units
Diameter: 12,103.6 km (7,520.83 miles)
224.7 Earth days
Rotation period: 243 Earth days
It has a thick, poisonous atmosphere of carbon dioxide and sulfuric acid.
Temperature: 456.85 C (854.33°
Composition: Its surface is covered with lava flows, quake faults and impact craters. Venus has abundant
small volcanoes and long lava flows. Venus has cool clouds and an extremely hot surface. Venus has a composition similar to
that of basaltic volcanic rocks found on Earth.
My weight on Venus: 75.281 pounds
facts: Venus spins backwards compared to other planets. One volcano on Venus is bigger than Mt. Everest.
Named after: Roman God of war and discord.
Mean Distance from the Sun: 227,936,640 km
Diameter: 6,794 km
period: 686.93 Earth days
Rotation period: 24.62 hours
Moons: 2: Phobos,
Atmosphere: 95% carbon dioxide, 3% nitrogen, 1.6% argon. There are some times giant dust storms
that get into the whole atmosphere.
Temperature: Surface temperature ranges from -87 to -5 °C
Mars is a small rocky body once thought to be very Earth-like. Volcanism, impacts from other bodies, movements of its crust,
and atmospheric effects such as dust storms have changed its surface.
My weight on Mars: 31.291 pounds
Interesting Facts: It has polar ice caps that grow and recede with the change of seasons.
Named after: God of all the Roman Gods.
Distance from the Sun: 778,412,010 km (4.84 x 108 miles) or 5.20 astronomical units
778,412,010 km (4.84 x 108 miles) or 5.20 astronomical units
Revolution period: 11.86 Earth years
period: 0.41 Earth days (9.8 Earth hours)
Moons: As of 2004, Jupiter has 62 known moons. Four
largest are Ganymede, Callisto, Io, and Europa.
Atmosphere: 90% hydrogen, 10% helium, .07% methane
14.85 - 19.85 C (58.73 - 67.73° F)
Composition: Jupiter's core is probably not solid but a dense, hot
liquid with a consistency like thick soup. The pressure inside Jupiter may be 30 million times greater than the pressure at
My weight on Jupiter: 196.212 pounds
Interesting Facts: Its immense,
complex atmosphere includes the Great Red Spot, a 300-year-old storm that is almost the size of three Earths.
Named after: Roman God of agriculture, and father of
Mean Distance from the Sun: 1,426,725,400 km (8.87 x 108 miles) or 9.54 astronomical units
120,536 km (74,897.6 miles)
Revolution period: 29.46 Earth years
0.44 Earth days (10.2 Earth hours)
Moons: 30: Titan is the largest, and the next six in size are Rhea,
Iapetus, Dione, Tethys, Enceladus, and Mimas.
Atmosphere: 97% hydrogen, 3% helium, .05% methane. Surface
Temperature: -139.15 C (-218.47° F)
Composition: Saturn is a gas giant. It is made mostly of hydrogen
My weight on Saturn: 76.028 pounds
Interesting Facts: Winds in the upper
atmosphere reach 500 meters per second in the equatorial region. These super-fast winds, combined with heat rising from within
the planet's interior, cause the yellow and gold bands visible in its atmosphere.
Named after: Greek God of the sky,
mate of the goddess of the Earth, and father of the Titans.
Mean Distance from the Sun: 2,870,972,200
km (1.78 x 109 miles) or 19.19 astronomical units
Diameter: 51,118 km (31,763.3 miles)
period: 83.75 Earth years
Rotation period: 0.72 Earth days or 17.9 Earth hours
Sixteen others had been discovered before 2001. Five of the largest are Miranda, Titania, Oberon, Umbriel, and Ariel.
83% hydrogen, 15% helium, 2% methane (at depth). The methane gas above the cloud layers gives it a blue-green color. When
the spacecraft flew past Uranus it saw few features to its atmosphere
Mean Surface Temperature: -197.15
C (-322.87° F)
Composition: It is a "gas giant" with no solid surface. It may have a small, silicate-rich
core, but most of its gas consists of water, ammonia and methane.
My weight on Uranus: 73.787 pounds
Interesting Facts: Uranus spins backwards compared to other planets.
Named after: Roman God of water.
Mean Distance from the Sun: 4,498,252,900 km (2.80 x 109 miles) or 30.07 astronomical units
55,528 km (34,503.5 miles)
Revolution period: 163.72 Earth years
0.67 Earth days (19.1 Earth hours)
Moons: 8: Naiad, Thalassa, Despina, Galatea, Larissa, Proteus, Triton,
Atmosphere: Its atmosphere contains hydrogen and helium with enough methane to give it a
Mean Surface Temperature: -200.15 C (-328.27° F)
Composition: Neptune is one of the
“Gas Giants” therefore Neptune has no solid surface.
My weight on Neptune: 93.375
Interesting Facts: Most of the time, it is the eighth planet from the Sun, but because of Pluto's
odd-shaped orbit, Neptune is actually the farthest out of the nine planets for about 20 years out of every 248 years.
Named after: Greek God of the dead and the underworld.
from the Sun: 39.48 AU (5,906,376,200 km)
Diameter: 2300 km
247.92 Earth years
Rotation period: 6.39 Earth Days
Moons: 1: Charon
perhaps methane and nitrogen
Min/Max Surface Temperature: -233/-223 °C
perhaps methane ice
My weight on Pluto: 5.561
Interesting Facts: Pluto spins backwards
to most other planets.
Mean Distance from
the Sun: 1 AU (149,597,890 km)
Diameter: 12756 km
Revolution period: 365.26
Rotation period: 1 day (23.93 hours)
Moons: 1: Luna
78% nitrogen, 21% oxygen, 1% argon
Temperature: -88/58 (min/max) °C
basaltic and granitic rock and altered materials.
My weight on Earth: 83 pounds
Facts: Oceans at least 4 km deep cover nearly 70 percent of Earth's surface.