Gravity & Motion
What force pulls object toward Earth?
Gravity
Which planet is closest to the Sun?
Mercury
What is the name for everything that exists in space?
The Universe
What does Velocity tell you about an object?
its speed and direction
What theory explains how the universe began?
The Big Bang Theory
What is it called when an object keeps moving unless a force changes its motion?
Inertia
Which planet is known as the Red Planet?
MArs
What is a large group of stars, gas, and dust held together?
A Galaxy
What is Tangent?
A straight path that touches a curved path
What is the straight-line path an object would follow if gravity did not pull it toward the center of its orbit?
Tangent Trajectory.
What two things determine how strong gravity is?
Mass and Distance
What shape is a planets orbit around the sun?
Ellipse (Oval)
What Galaxy do we live in?
The Milky Way
what is the difference between balanced and unbalanced forces?
Balanced forces do not change motion; Unbalanced forces change motion
what process give stars their energy?
Fusion
Why does the Moon stay in orbit around Earth instead of flying away?
Earths gravity pulls it toward Earth
Which planets take the longest time to orbit the Sun?
Neptune
What is found inside a galaxy?
Stars, gas, dust, planets, and other space objects
Newtons first law of motion?
An object stays still or keeps moving unless a force changes it
What is Cosmic Radiation?
Energy that travel through space from objects and events in the universe.
If two objects are moving at the same speed, but one has more mass, which object has more inertia?
The object with more mass
Its Orbit becomes larger, and take longer to go around the sun
How is a galaxy different from the universe?
A galaxy is one group of stars and space objects; the universe contains all galaxies and everything in space.
Gravitational Pull
The force that pulls objects toward each other
What is a constellation?
A group of stars that form a pattern in the sky