Hubble's Discovery of the Expanding Universe

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What is the relationship between the speed of celestial objects and their distance from Earth, according to Hubble's law?

The speed of celestial objects decreases as they move away from Earth

The speed of celestial objects is directly proportional to their distance from Earth (correct)

The speed of celestial objects is inversely proportional to their distance from Earth

There is no relationship between the speed of celestial objects and their distance from Earth

What is the term used to describe the speed at which celestial objects move away from Earth?

Blueshift

Recessional velocity (correct)

Expansion velocity

Redshift

What is the significance of the data point with a negative recessional velocity in Hubble's graph?

It indicates an object at rest with respect to Earth

It indicates an object moving in a circular motion around Earth

It indicates an object moving away from Earth at a slower rate

It indicates an object moving towards Earth (correct)

What is the technique used by Henrietta Leavitt to measure distances to remote objects in the sky?

Variable star method Signup and view all the answers

What is the implication of Hubble's law on our understanding of the universe?

The universe is expanding Signup and view all the answers

What is the speed at which the galaxy M 83 is moving away from Earth?

513 km s^-1 Signup and view all the answers

What is the relationship between the distance of a galaxy from Earth and its velocity, according to Hubble's discovery?

The velocity of a galaxy increases as the distance from Earth increases Signup and view all the answers

What is the analogy used to describe the expansion of the Universe?

An expanding two-dimensional shape, like a balloon Signup and view all the answers

What did Hubble discover about the objects he was observing?

They lay far beyond the Milky Way Signup and view all the answers

What theory did Hubble's discovery provide additional evidence for?

The Big Bang Theory Signup and view all the answers

What is the difference between the expansion of a balloon and the expansion of the Universe?

The balloon expands into existing space, while the Universe includes all of space itself Signup and view all the answers

What is the name of the Belgian priest and astronomer who first proposed the Big Bang Theory?

Georges Lemaître Signup and view all the answers

What did Hubble’s law allow astronomers to calculate?

How long ago galaxies started moving apart Signup and view all the answers

Why did geologists reject Hubble’s initial estimate of the Universe’s age?

They had measurements showing the Earth to be older than the Universe Signup and view all the answers

What is the current estimated age of the Universe?

13.7 billion years Signup and view all the answers

What is special about the galaxies seen in the Hubble eXtreme Deep Field (XDF)?

Their light has taken 13.2 billion years to reach us Signup and view all the answers

What does the image of the Hubble eXtreme Deep Field (XDF) represent?

The Universe when it was 500 million years old Signup and view all the answers

Why did Hubble’s initial image of the Andromeda Galaxy appear reversed?

The photographic plate was reversed Signup and view all the answers

Hubble's Discovery of the Expanding Universe

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