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Terms in this set (33)
A massive object in space that orbits a star and does not produce light of its own
a star with enough gravitational force that object in space orbit it. (In our system, we have the sun, the planets, their moons and other space objects that orbit the sun.)
4 inner planets
- Mercury, Venus, Earth, Mars;
- Planets closest to sun;
- All have rocky surfaces;
4 outer planets
- Jupiter, Saturn, Uranus, Neptune;
- Large with rings around them;
- Mostly made of gas;
- an attractive force that acts between any two objects
- the force that pulls objects of different masses together.
law of universal gravitation
If an object is more massive than and/or closer to another object, then it will have a stronger gravitational force.
regular, repeating path that an object in space follows around another object
Any object that orbits around another object in space (natural or artificial)
The forward motion of an object in space.
The spinning motion of a planet on its imaginary axis.
1 full orbit of a planet around a star (the Sun) = 1 year.
the average distance between the earth and the sun = 1 AU
A force of attraction between objects that is due to their masses.
Why Pluto is not a planet?
-Very small- smaller than the moon
-Very strange orbit- it overlaps the orbit of Neptune
Planets that are small, dense, and rocky: Mercury, Venus, Earth and Mars
Large cold planets with ring systems, many moons and lack solid surfaces, Jupiter, Saturn, Uranus, Neptune
the region of the solar system between the orbits of Mars and Jupiter, where many asteroids are found
any of numerous small celestial bodies composed of rock and metal that move around the sun
A region of the solar system that is just beyond the orbit of Neptune and that contains small bodies made mostly of ice, asteroids, and scarf planets
A spherical region of comets that surrounds the solar system, not much is known about it.
a celestial object consisting of a nucleus of ice and dust and, when near the sun, a "tail" of gas and dust particles pointing away from the sun.
The fuzzy outer layer of a comet that occurs when the comet approaches the Sun
smaller chunks of small matter (rock/metal), that burn up in our atmosphere called shooting stars
a meteoroid that reaches the Earth's surface without burning up completely
Giant Impact Theory
a scientific theory that explains how the Moon was formed
A large round pit caused by the impact of a large space object.
a cycle of rising and falling ocean levels
an event that occurs when the Earth's shadow falls on the moon.
an event that occurs when the Moon's shadow falls on Earth
the gradual change in the appearance of the Moon due to the positions of Earth, the Moon, and the Sun.
As the Earth revolves around the Sun
A giant ball of hot gas, mainly composed of hydrogen and helium, held together by gravity.
a phenomenon that occurs when Earth's atmosphere is energized by solar winds
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