Who first noticed that for Cepheid variable stars, there was a direct relation between the luminosity and the period of the variation in their brightness?
a. Henrietta Leavitt
b. Edwin Hubble
c. John Glenn
d. Carl Sagan
e. Annie Cannon
A
Physics & Space Science
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For an object in uniform circular motion, the acceleration points toward ______________
Fill in the blank(s) with correct word
Physics & Space Science
Galileo was the first to observe the phases of ________.
A. Venus B. Earth C. the moon D. the sun
Physics & Space Science
Who discovered Neptune in the late 19th century?
a. Galileo b. Herschel c. Galle d. Le Verrier and Adams e. Tombaugh and Lowell
Physics & Space Science
How was Pluto's surface mapped?
A) by mapping with the New Horizons spacecraft B) by measuring the change in brightness as Charon eclipsed Pluto C) by imaging with the Hubble Space Telescope D) by imaging with powerful ground based telescopes E) Pluto is too far away for its surface to be mapped.
Physics & Space Science