Gravity
What force pulls objects toward each other?
gravity
What do we call a large group of stars, gas, and dust held together by gravity?
galaxy
Why does the sun appear so much larger and brighter than other stars?
Because it is the closest star to us
What happens to gravity when the mass of an object increases?
gravity increases
What happens to an object’s weight if the gravity increases?
it becomes heavier
Name our galaxy.
Milky Way
What can make a star appear brighter from Earth?
Being closer to earth
How does distance affect the gravitational pull between two objects?
gravity decreases as distance increases
Why do astronauts feel weightless in space?
Because they are in free fall, not because there is no gravity.
What type of galaxy is shaped like a flat disk with a bulging center?
spiral galaxy
Why do some stars look brighter than others, even if they are the same size?
distance from earth
What can cause the gravitational force of an object to increase or decrease?
What is the term for the gravitational pull of the Earth?
Earth's gravity or gravitational pull
How many galaxies are estimated to be in the universe?
around 100 billion
What is the term for how bright a star really is?
actual brightness
If you double the mass of one object, how does that affect the force of gravity?
doubles the gravitational force
How does gravity affect the motion of planets around the sun?
keeps the planets in orbit around the sun
What is the name of a galaxy without a defined shape
What term describes how bright a star appears from Earth?
apparent brightness
Why do larger planets have a stronger gravitational pull than smaller ones?
because they have more mass