A fascinating tour through our solar sytem, based on NASA's Science on a Sphere program "The Wanderers".
In ancient times, humans watched the skies looking for clues to their
future and to aid in their very survival. They soon observed that some
stars were not fixed, but moved in the sky from night to night. They
called these stars the wanderers
At the center of our solar system is the sun, binding the planets with
its gravitational pull. From our viewpoint on earth, the sun appears
small in the sky, but in reality it dwarfs even Jupiter, the largest
planet in the solar system.
The distance from the sun to the
small worlds traveling it are vast. Light takes eight minutes to reach
earth, and nearly a day to reach the farthest known bodies. Join us now
as we tour our solar system, starting with sun-baked mercury and
traveling to the remotest outskirts, where small, icy bodies move with
only the faintest connection to our sun.
Mercury, the closest planet to Sun is also the smallest terrestrial planet. It
orbits so swiftly that its year lasts only 88 Earth days. The airless
cratered surface could almost be mistaken for our moon, relentlessly
bombarded by meteoroids for four and a half billion years. One of these
encounters left a giant scar called the golarus basin, one of the
largest impact sights in the solar system. Temperatures on the surface
of mercury can reach a blistering 800 degrees Fahrenheit, and can dip to
300 degrees below zero on the night side.
Venus, as seen from Earth, is the brightest object in sky after the Sun and Moon.
Russian probes were the first to land on Venus in the 1970's and 1980's.
Venus's surface is volcanic. Its atmosphere is composed of thick, dense
carbon dioxide with sulfuric acid clouds. Both are potent greenhouse
gases that trap incoming sunlight. Venus rotates slowly—one Venusian day
lasts almost four Earth months.
Earth is the only planet with life as we know it. The atmosphere and temperatures are
"just right" for life. It is the only known body in our solar system
where water can exist as a gas, liquid,
and solid. Vast oceans
dominate surface of the planet. Seasonal changes occur on the surface.
Earth has a solid surface that constantly shifts due to plate tectonics.
Mars Once geologically active, Mars has the largest dormant volcano in the solar
system, Olympus Mons. It also hast the longest valley in the solar
system, called Valles Marineris. Mars has a thin, atmosphere primarily
composed of carbon dioxide. Surface conditions are dynamic. Mars has
seasons as well as massive dust storms that cover the planet. Its
surface features include the smooth, low-lying northern hemisphere and
the craggy, heavily-cratered southern uplands. Evidence suggests that
Mars had water running on its surface at some time in the past.
The asteroid belt is composed of small rocky pieces. The big question is
"What happened here?" and "Why no planets?" The asteroid Ceres is large
enough to be classified as a dwarf planet.
is the largest and most massive planet in the Solar System. It rotates
rapidly, completing one rotation every 10 hours. Long-lasting,
high-speed winds and storms dominate Jupiter's atmosphere. Jupiter has a
faint planetary ring system and over 63 moons. The largest moons,
discovered by Galileo in 1610, vary widely.
Io is volcanically
active. Europa's cracked surface likely hides an ocean below. Ganymede
is the largest moon in the Solar System. Callisto is heavily cratered.
seemingly serene atmosphere hides powerful storms and winds on its
surface. Saturn is known for its extensive ring system made of chunks of
ice, rock, and dust with small moonlets embedded within the rings.
Saturn has more than 60 moons. Conditions vary among the moons.
the largest moon, has a thick, smoggy, atmosphere covering its icy
surface with lakes of liquid methane or ethane. Small Enceladus has
water and ice geysers at its south pole. Its water vapor coat other
nearby moons and create a thin Saturn ring.
receives 400 times less sunlight than Earth. Uranus lies nearly
sideways, making its axis nearly parallel to the plane of the Solar
System. This extreme tilt give rise to seasons that last nearly 28 Earth
years. Uranus as many moons and a faint ring system. It has only been
visited by one spacecraft, Voyager 2, in 1986. Like the other giant
planets, Uranus's atmosphere is primarily hydrogen and helium with a
trace of methane gas over deep clouds, giving it a pale blue-green tint.
also has many moons and a faint ring system. Its Great Dark Spot, a
large storm with extremely strong winds, disappeared in the 1990s.
Neptune's vivid blue color is due to its frigid temperature: -371°F
In: Science and Technology, Other
Tags: Tour, Solarsystem, Space, Planets, Sun, Earth, NASA
Location: United Kingdom (UK/GB) (load item map)
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