Asteroids, comets, meteors, and moonsPresentation Transcript
Comets You can tell it is a comet because of its tail. A comet is an icy small Solar System body that, when close enough to the Sun, displays a visible coma (a thin, fuzzy, temporary atmosphere) and sometimes also a tail. Asteroids are thought to have a different origin from comets, having formed inside the orbit of Jupiter rather than in the outer Solar System.
Asteroids There are millions of asteroids, and like most other small Solar System bodies the asteroids are thought to be remnants of Planetesimals Planismals are small pieces of planets floating in space The large majority of known asteroids orbit in the main asteroid belt between the orbits of Mars and Jupiter
Meteors Meteors are certain sized Asteroids
Moons The Moon is Earth's only natural satellite and the fifth largest satellite in the Solar System. It is the largest natural satellite in the Solar System It is the second densest satellite after Io, Jupiter's moon. It is in synchronous rotation with Earth. It is the brightest object in the sky after the Sun. The Moon's gravitational influence produces the ocean tides and the minute lengthening of the day. The Moon's current orbital distance, about thirty times the diameter of the Earth, causes it to appear almost the same size in the sky as the Sun, allowing it to cover the Sun nearly perfectly in total solar eclipses.
Moons Orbit New Moon Waxing Crescent First Quarter Waxing Gibbous Full Moon Waning Gibbous Last quarter Waning Crescent
What would happen if earth had a 2nd moon? The moon creates tides on Earth. So 2 moons means more tides. You need to consider if the 2nd moon is more or less massive than the Moon - gravity (and therefore tides). If the 2nd moon is half the distance but the same mass as the Moon, its gravitational effect is 4 times that of the Moon. And at half the distance it would orbit the Earth in half the time, so we would have tides about 4 times the height twice as often (therefore 4 times a day) as the twice-daily tides from the Moon.
What would happen if the distance to the moon increased or decreased? If it decreased there would be more tides and higher tides. If it is increased there would be less tides and lower tides.
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