What is the significance of the Tully-Fisher relation?
The Tully-Fisher relation gives astronomers another direct measurement tool for
determining the absolute magnitude of a spiral galaxy using the width of H2 lines in
the light spectrum that is independent of the radial motion measurements made using
red-shifts.
Physics & Space Science
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Genetic studies indicate that every living organism on Earth today shares a common ancestor
Indicate whether the statement is true or false
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How much energy is in a 63 kHz photon of AM-radiation?
a. 1.0 × 10^?38 J b. 6.6 × 10^?30 J c. 4.2 × 10^?29 J d. 3.1 × 10^?30 J e. 13 × 10^?29 J
Physics & Space Science
What form of interplanetary debris did mankind discover first? Why?
What will be an ideal response?
Physics & Space Science
In age, the surface of Venus is much ________ than even the lunar mare
Fill in the blank(s) with correct word
Physics & Space Science