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8-26 notes - The Solar System The Sun and all objects...

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The Solar System The Sun and all objects gravitationally attracted to it The Sun The Sun is a star; it’s the closest star to us, so much so that when sun is near the horizon it’s so bright other stars can’t be seen The key objects that orbit the sun are planets; today there are eight of them Mercury Half the size of the Earth, orbits the sun in about 88 Earth days Named for the Roman messenger god Venus Almost the same size and mass of Earth Carbon dioxide atmosphere; surface temperature is about 1000 degrees Still very similar to the Earth in many respects Earth Has a moon; it’s called Moon Moon orbits Earth and is gravitationally attracted to it; it orbits Earth in 29.5 days Mars Closer in size to Mercury than to the Earth Has moons (two of them) First four planets are fairly close to the sun, then there’s a big jump to the outer planets Jupiter Has moons (as many as 100) Brightest object in the night sky beyond Venus Saturn Has moons These 7 moving objects in the sky have been known for the longest time; maybe it’s
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8-26 notes - The Solar System The Sun and all objects...

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