Understanding the Expanding Universe

The video explores the dynamic nature of the universe, starting with Einstein's theory of gravity and the concept of a static universe. It explains how redshift indicates that galaxies are moving away, leading to the discovery of the universe's expansion by Hubble. The video then discusses experiments to measure the universe's fate using type 1A supernovae as standard candles. It concludes with the surprising discovery that the universe is accelerating, attributed to dark energy, which makes up 73% of the universe.

What did Vesto Slipher observe about galaxies in 1916?

• They were moving towards the Milky Way.

• They were moving away from the Milky Way.

• They were colliding with each other.

• They were stationary.

What is the significance of redshift in astronomy?

• It measures the age of a star.

• It shows the chemical composition of a galaxy.

• It indicates the temperature of a star.

• It reveals the motion of galaxies relative to us.

What is a 'standard candle' in astronomy?

• A star that changes brightness over time.

• A planet that reflects sunlight.

• An object with a known brightness used to measure distances.

• A galaxy that is moving towards us.

What type of astronomical event is used as a standard candle in the experiment?

• Type 1A Supernova

• Black Hole

• Neutron Star

• Pulsar

What happens to a white dwarf star in a Type 1A Supernova?

• It slowly fades away.

• It explodes with immense brightness.

• It becomes a black hole.

• It turns into a neutron star.

What unexpected result did the 1997 experiment reveal about the universe?

• The universe is shrinking.

• The universe is speeding up.

• The universe is static.

• The universe is slowing down.

What is the term used to describe the force causing the universe to accelerate?

• Dark Matter

• Dark Energy

• Gravitational Waves

• Cosmic Rays

What percentage of the universe is thought to be made up of dark energy?

• 85%

• 73%

• 60%

• 50%

What is the likely fate of the universe according to the discovery of dark energy?

• It will collapse into a singularity.

• It will oscillate between expansion and contraction.

• It will expand forever.

• It will remain static.

What did Einstein originally call the force now known as dark energy?

• Gravitational Constant

• Energy Constant

• Cosmological Constant

• Universal Constant