DARK MATTER - tedED

According to the ancient Greeks, what were the four basic elements that could make up the universe?

• Earth, wind, fire, and water

• Earth, air, fire, and metal

• Earth, wind, fire, and ice

• Earth, air, fire, and water

What did Leucippus of Miletus propose in the 5th century B.C.?

• The universe is made up of visible and invisible elements

• The universe is made up of earth, air, fire, and water

• The universe is made up of dark matter and dark energy

• The universe is made up of tiny, indivisible bits of stuff called atoms

What percentage of the universe is made up of Leucippus's atoms and the things they're made of?

• 95%

• 5%

• 27%

• 68%

What did scientists discover about the motion and weight of galaxies in the 1930's?

• There's not enough visible stuff in galaxies to hold them together

• There's no weight in galaxies

• There's too much visible stuff in galaxies to hold them together

• There's no motion in galaxies

What is the best evidence for dark matter today?

• Measurements of the dark matter in stars

• Measurements of the dark energy in galaxies

• Measurements of the visible matter in galaxies

• Measurements of the cosmic microwave background

What percentage of the universe is made up of dark energy?

• 95%

• 68%

• 27%

• 5%

What theory predicts a whole range of new particles that could make up the dark matter?

• String theory

• Quantum theory

• Relativity theory

• Supersymmetry

What do speculative theories about dark energy point to?

• The idea that the universe is made up of visible and invisible elements

• The idea that the universe is made up of a single vibrating string

• The idea that the universe is made up of dark matter and dark energy

• The idea that the universe is made up of tiny, indivisible bits of stuff called atoms

What did scientists studying the outer reaches of the universe confirm early this century?

• The universe's expansion seems to be accelerating

• The universe's expansion seems to be decelerating

• The universe's expansion seems to be constant

• The universe's expansion seems to be reversing

What is remarkable about humans in relation to the universe?

• They are the only species in the universe

• They are the only species in the universe able to grasp its wonders

• They are the only species in the universe living at the right time

• They are the only species in the universe with understanding