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If we were to construct an accurate scale model of the solar system on a football field with the Sun at one end and Neptune at the other, the planet closest to the center of the field would be
In the leading theory of solar system formation, the planets
formed from the same flattened, swirling gas cloud that formed the Sun.
The solar system is differentiated because
only rocky and metallic particles could form close to the Sun
According to the chart in Discovery 4-1 in the textbook, an impact resulting in global catastrophe is expected to occur roughly once per
So far, beyond the solar system the extrasolar planets found have been mostly
large jovians with terrestrial-type orbits.
Most of the extrasolar planets found so far were detected by
noting the Doppler shifts of the star as the planet orbits it from side to side
Which statement about extrasolar planets found to date is true?
Some are so close to their stars that their periods are just a few days
In addition to revolving around the Sun counter clockwise, most planets also rotate on their axis counter clockwise
Meteor showers are
caused by the Earth passing near the orbit of an old short-period comet and usually annual events, as the orbits again intersect
We would expect other planets beyond our own solar system to orbit the equators of their home stars, as our own planets orbit the Sun.
Characteristics of terresterial planets
small size, solid rocky surface, located within the inner solar system
Characteristics of jovian planets
low average density, extensive ring system, numerous orbiting moons, primarily composed of hydrogen, helium, and hydrogen compounds
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