Exploring the Universe's Expansion

What was Edwin Hubble's major contribution to astronomy in the 20th century?

• Discovery of black holes

• Identifying the first exoplanet

• Mapping the Milky Way

• Discovery of the universe's expansion

What was the initial range of estimates for the universe's expansion rate before the Hubble Space Telescope?

• 8 to 20 billion years

• 1 to 5 billion years

• 20 to 50 billion years

• 15 to 30 billion years

What is the estimated value of the Hubble constant according to the SH0ES team?

• 42

• 80

• 67.5

• 73

What is the significance of the discrepancy in the universe's expansion rate measurements?

• It shows the universe is shrinking

• It confirms the age of the universe

• It suggests a new layer of physics

• It disproves the Big Bang theory

What did the Planck Mission predict about the Hubble constant?

• It should be 80

• It should be 73

• It should be 42

• It should be 67.5

What are cepheids used for in astronomy?

• Identifying new galaxies

• Calculating cosmic distances

• Determining the age of stars

• Measuring the mass of black holes

What is a major challenge in using cepheids for measuring cosmic distances?

• They exist in dust-filled regions

• Their brightness is too low

• They are too far away

• They are not visible in the Milky Way

What alternative to cepheids is being explored for measuring cosmic distances?

• Pulsars

• Quasars

• Neutron stars

• Red giants

What is the role of the James Webb Telescope in future cosmic measurements?

• To study the sun

• To replace the Hubble Telescope

• To observe black holes

• To measure cosmic milepost markers at greater distances

What is the potential impact of the James Webb Telescope on our understanding of the universe?

• It will end the study of dark energy

• It will provide sharper resolution of cosmic markers

• It will discover new planets

• It will confirm the Hubble constant