Space
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What is a planet?
A spherical object that orbits a star.
What is a star?
A very large sphere of burning gas in space.
State the name of the star the earth travels around.
The sun
What word is used to describe the path an object takes around another object in space?
Orbit
What name is given to the planets and other objects that orbit the sun?
The solar system.
What shape do most planetary orbits have>
Elliptical.
Name the planets in our solar system in order of distance from the sun.
Mercury, Venus, earth, mars, Jupiter, Saturn, Uranus, Neptune.
What is an asteroid?
A small rocky object orbiting the sun.
What is a comet?
An object made of rock, ice and dust orbiting the sun.
What is a galaxy?
A group of billions of stars.
What is the universe?
All objects in space together.
What is a vacuum>
An area which has no particles.
What is a light year?
The distance travelled by light in a year.
How is a protostar formed?
The force of gravity pulls the dust and gas together.
What word is used to describe the amount of material in an object.
Mass
What is the unit and unit symbol for mass.
kilograms, kg.
What is a field?
The area around an object where a non-contact force acts.
What kind of field causes weight?
Gravitational field.
How does mass change in the universe?
It does no change; it remains the same.
How does weight change in the universe?
It depend on the gravitational field strength of a location.
What type of force is gravity?
Non-contact force.
Which two factors affect the weight of an object?
Mass and gravitational field strength.
What is gravitational field strength?
How strong a gravitational field is.
What is the gravitational field strength on Earth?
9.8N/kg.