Gravity
What factors determine the force of gravity?
The mass of the objects and the distance between them
__________________ is a cloud of gas and dust
nebula
How are galaxies distributed?
In clusters held together by gravity.
Which planet is the Sun's gravitational pull stronger?
Mercury or Saturn
Mercury
How do stars begin to form?
Through gravity causing dense parts of nebulae to collapse
How did our solar system form?
From a cloud of dust and gas called a planetary nebula.
What type of galaxy is the Milky Way?
spiral
Which planet is the Sun's gravitational pull stronger?
Neptune or Earth
Earth
_______________________ is force that every object exerts on all other objects because of their masses.
gravity
What shape is a planet's orbit?
ellipse
How many galaxies are in the Virgo Cluster?
2,000
How many plants are in our solar system?
8
When protostars contract They pull in surrounding gas and produce ____________ energy.
thermal
How does a planet's speed change?
faster when its closer to the sun
What are the three major types of galaxies?
Spiral, elliptical, and irregular.
gravitation pull is _____________ when the mass of an object is less
Why is the Sun's gravitational pull stronger on Venus?
Because Venus is closer to the Sun than Earth.
________________ is a huge collection of stars
galaxy
What is expected to happen to the Milky Way in 3 billion years?
It will merge with the Andromeda Galaxy.
gravitation pull is _____________ when objects move further away from each other
weaker