Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
16 Cards in this Set
- Front
- Back
|
Newton's Law of Universal Gravitation
|
A mathematical rule that tells us how the strength of the force of gravity depends on mass and distance.
|
|
|
Orbit
|
The repeating circular (or elliptical) path an object takes around a gravity source, such as a planet or star.
|
|
|
Tide
|
A cycle of rising and falling sea levels that repeats every 12 hours.
|
|
|
Planet
|
A massive, round body held together by its own gravity that revolves around a star in its own orbit.
|
|
|
Solar System
|
The Sun, planets, moons, and other objects that are gravitationally bound to the sun.
|
|
|
Terrestrial Planets
|
Mercury, Venus, Earth, and Mars.
|
|
|
Gas Planets
|
Jupiter, Saturn, Uranus, and Neptune.
|
|
|
Asteroid
|
An object that orbits the Sun but is too small to be considered a planet.
|
|
|
Comet
|
An object in space made mostly of ice and dust.
|
|
|
Meteor
|
A chunk of burning rock traveling through Earth's atmosphere.
|
|
|
Meteorite
|
A meteor that passes through Earth's atmosphere and strikes the ground.
|
|
|
Star
|
An enormous hot ball of gas held together by gravity which produces energy through nuclear fusion reactions in its core.
|
|
|
Nuclear Fusion
|
Reactions which combine light elements such as hydrogen into heavier elements such as helium, releasing energy.
|
|
|
Light Year
|
The distance light travels through space in one year-9.46 x 10^12 km.
|
|
|
Galaxy
|
A group of stars, dust, gas, and other objects held together by gravitational forces.
|
|
|
Milky Way Galaxy
|
The spiral galaxy to which our solar system belongs.
|
