the solar system kayli white & anne riley. the inner planets vs. the outer planets the inner...
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The Solar System
Kayli White & Anne Riley
The inner planets vs. the outer planets
• The inner planets: Mercury, Venus, Earth, and Mars. They are relatively small, composed mostly of rock, and have few or no moons.
• The outer planets: Jupiter, Saturn, Uranus, Neptune, and Pluto.They are huge, mostly gaseous, ringed, and have many moons The exception is Pluto, the dwarf planet, which is small, rocky, and has one large moon plus two tiny ones.
Temperatures of the Planets
• Generally, the farther from the Sun, the cooler the planet. Differences occur when the greenhouse effect warms a planet (like Venus) surrounded by a thick atmosphere.
Density of the Planets
• The outer, gaseous planets are much less dense than the inner, rocky planets.
• The Earth is the densest planet.
• Saturn is the least dense planet; it would float on water.
A day on the Planets Compared to Earth
• A day is the length of time that it takes a planet to rotate on its axis (360°). A day on Earth takes almost 24 hours.
The planet with the longest day is Venus. A day on Venus takes 243 Earth days. (A day on Venus is longer than its year; a year on Venus takes only 224.7 Earth days)
The planet with the shortest day is Jupiter. A day on Jupiter only takes 9.8 Earth hours.
Mercury• Planet closest to the
Sun• Has no moons• Dry, nearly airless,
and full of craters• Much like our moon• Mercury's core is 75%
of Mercury by volume and 80% of it by mass
Venus• Second planet closest to
the Sun• Has no moons• Atmosphere is 97%
carbon dioxide• It’s surface temperature
is 480 °C (896 °F)
Earth• Third planet from the Sun• Has one moon• Only planet capable of
sustaining life• Three distinct layers. The
core is the central part made up of molten nickel and iron.
• The next layer is the mantle consisting of solid, hot rock.
• The crust upon which we walk and live is the upper-most layer, consisting of soil, clay, and fine rock.
Mars• Fourth planet from the
Sun• Has 2 moons• Has a reddish color due
to the iron oxide (rust) that is in the soil
• Has the largest volcano• Most Earth-like planet
and may one day habitat humans
Jupiter• Fifth planet from the
Sun• Has 18 large moons and
many small ones• About 1,320 Earths
could fit inside of it• Has faint ring system• Great Red Spot: gigantic
storm on Jupiter’s surface
Saturn• Sixth planet from the
Sun• Has 18 large moons and
many small ones• Gas giant composed of
hydrogen, with small proportions of helium.
• Has rings consisting mostly of ice particles
• Least dense planet
Uranus• Seventh planet from the
Sun• Has 15 moons• First planet to be
discovered• Has a system of about
11 rings• Atmosphere composed
of hydrogen, helium, methane, and ammonia
Neptune• Eighth planet from the sun• Has 2 moons• Atmosphere composed of
hydrogen, helium, methane, and ammonia
• Uranus’ twin• Great Dark Spot: (left)
a depression in the atmosphere surrounded by high cirrus clouds
Pluto• Farthest planet from
the Sun• Has 1 large and 2 small
moons• Considered a dwarf
planet• Small, rocky
Space Probes• A space vehicle carrying
sophisticated instrumentation but no crew
• Goes around planets collecting information and pictures to help scientist understand the weather and changes that planets go through
• Unlike an artificial satellite, which is placed in a permanent orbit around the earth, a space probe is launched with enough energy to escape the gravitational field of the earth and navigate among the planets.
• Many do not return back to Earth
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