How do we know the universe is 13.8 billion years old?

The video explores the age of the universe, estimated at 13.8 billion years, and the methods used to determine this figure, such as observing the universe's expansion and redshift. It discusses assumptions in cosmology, the role of dark matter and dark energy, and the intriguing Methuselah star, which may challenge current estimates. The video concludes with thoughts on future research and technological advancements.

What is the current rate of the universe's expansion known as?

• The Cosmic Constant

• The Hubble Constant

• The Expansion Rate

• The Redshift Factor

What assumption is made about the universe's density on the largest scales?

• It is completely empty

• It is denser in some regions

• It is uniformly dense

• It is non-uniform and varies greatly

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

• 5%

• 27%

• 68%

• 100%

What is believed to be the driving force behind the universe's expansion?

• Dark Matter

• Observable Matter

• Dark Energy

• Gravitational Waves

What is the estimated age of the Methuselah star?

• 15 billion years

• 12 billion years

• 14.5 billion years

• 13.2 billion years

What is the significance of the Methuselah star in the context of the universe's age?

• It challenges the estimated age of the universe

• It is the largest star known

• It is the youngest star discovered

• It confirms the universe's age

What future telescopes are mentioned as having missions to explore the universe's past?

• Hubble and Spitzer

• Chandra and Kepler

• WFIRST and James Webb

• Voyager and Pioneer