Who had provided the first evidence of nebulae's high recession velocities?
Vesto Slipher
Galileo Galilei
Carl Sagan
Stephen Hawking
Answer
Vesto Slipher was an American astronomer who discovered the first evidence that nebulae are moving away from the Earth. In 1912, he published a paper in which he reported that the spectral lines of nebulae were shifted to the red, which indicated that they were moving away from us. This was the first evidence of the expansion of the universe.
Exploring the Cosmos: Discovering Edwin Hubble's Universe
More Questions
Who proposed the idea of galaxy's recessional velocity increasing with distance, that Hubble proved?
Which well-known astronomical tool is named after Hubble?
Where is Hubble's model of his famous space telescope prominently displayed?
What objects did Hubble prove were actually galaxies?
What does the red shift of nebulae signify?
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