18 Questions
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 is directly proportional to their distance from Earth
What is the term used to describe the speed at which celestial objects move away from Earth?
Recessional velocity
What is the significance of the data point with a negative recessional velocity in Hubble's graph?
It indicates an object moving towards Earth
What is the technique used by Henrietta Leavitt to measure distances to remote objects in the sky?
Variable star method
What is the implication of Hubble's law on our understanding of the universe?
The universe is expanding
What is the speed at which the galaxy M 83 is moving away from Earth?
513 km s^-1
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
What is the analogy used to describe the expansion of the Universe?
An expanding two-dimensional shape, like a balloon
What did Hubble discover about the objects he was observing?
They lay far beyond the Milky Way
What theory did Hubble's discovery provide additional evidence for?
The Big Bang Theory
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
What is the name of the Belgian priest and astronomer who first proposed the Big Bang Theory?
Georges Lemaître
What did Hubble’s law allow astronomers to calculate?
How long ago galaxies started moving apart
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
What is the current estimated age of the Universe?
13.7 billion years
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
What does the image of the Hubble eXtreme Deep Field (XDF) represent?
The Universe when it was 500 million years old
Why did Hubble’s initial image of the Andromeda Galaxy appear reversed?
The photographic plate was reversed
Learn about Edwin Hubble's groundbreaking discovery that revealed the expansion of the universe. Explore how he used spectroscopic red-shift data to measure distances and speeds of celestial objects. Discover the significance of his findings and how they changed our understanding of the cosmos.
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