Year 10 Science Revision - The Universe

What is a galaxy?

• a star and its surrounding planets

• billions of stars held together by gravity

• the Big Bang

• a cluster of nebulas

What does the Universe consist of? .

• Celestial bodies

• Space 

• Space and all the matter in it

• Planets and stars

Which piece of evidence supports the Big Bang theory?

• Galaxies move towards each other due to gravity

• Galaxies further from Earth are moving with a greater velocity than galaxies closer to Earth

• The more distant galaxies are moving towards us

• Galaxies and space is not changing

Thought to be leftover thermal energy from the "big bang" and fills the entire universe.

• Redshift

• Cosmic Microwave Background Radiation

• Hubble's Law

• Doppler Effect

Once a star burns all its Hydrogen it begins to burn Helium and becomes a ____________.

• Main Sequence Star

• Giant/Supergiant

• Supernova

• White Dwarf

A light year is...

• The speed light travels
• How long it takes light to get to you from the sun
• The distance light can travel in a year
• How many years it takes light to be emitted

Which star has the lowest temperature?

• A

• B

• C

• D

Which star has the lowest luminosity?

• A

• B

• C

• D

What does the Big Bang theory suggest?

• The universe was just there

• The Milky Way is the only solar system

• The universe is continually expanding and cooling

• The universe started as a point and is moving towards each other

The brightness of an object such as a star as it appears from earth is called (note: a more negative value = brighter)

• Absolute magnitude

• Apparent Magnitude

• Luminosity

• Light Year