P16 Space (Triple Only)

What is the main force that causes particles of dust and gas to come together to form a protostar?

• Centripetal force

• Gravitational attraction

• Electromagnetic force

• Nuclear fusion

What happens to the protostar as gravitational forces continue to pull it together?

• It becomes less dense

• It becomes denser

• It starts to cool down

• It starts to break apart

What is the name given to the effect that makes the wavelengths of light longer if the light source is moving away from the observer?

• Blue-shift

• Red-shift

• Green-shift

• Yellow-shift

What is the result of the nuclear fusion reactions in stars?

• The star becomes a black hole

• The star releases huge amounts of energy

• The star stops emitting light

• The star's mass increases

What is the term used to describe the orbits of the Moon and artificial satellites around the Earth?

• Elliptical orbits

• Circular orbits

• Parabolic orbits

• Hyperbolic orbits

What is the Big Bang theory?

• A theory that suggests the universe is contracting

• A theory that suggests the universe started off as an extremely small, hot, and dense object that exploded

• A theory that suggests the universe is static and unchanging

• A theory that suggests the universe is infinite and has no beginning

What is the Milky Way galaxy?

• A galaxy that contains only the Sun

• A galaxy that contains billions of stars

• A galaxy that contains only planets

• A galaxy that contains only comets

What happens to the speed of an orbiting object if the radius of the orbit increases?

• The speed increases

• The speed decreases

• The speed remains the same

• The speed fluctuates

What is the main sequence star?

• A cloud of gas and dust in space

• A star that is in the longest and most stable part of its life cycle

• A star that is about to explode

• A star that has exhausted its nuclear fuel

What is a supernova?

• The birth of a new star

• The explosion of a massive star

• The formation of a black hole

• The cooling down of a star