Refined the Earth-centered Solar System
A. Solar Eclipses |
B. Alpha Centauri |
C. Proxima Centauri |
D. Lunar Eclipses |
E. Nicolas Copernicus |
F. Claudius Ptolemy |
F. Claudius Ptolemy
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Why does conversion of its core to iron have to mark the end of a star's life? Which stars can end up with iron cores?
What will be an ideal response?
The mass of the Milky Way Galaxy can be estimated by:
A) the orbital motions of the stars within the galaxy. B) the mass of the planets in the Solar System. C) the luminosity of the stars of the neighboring galaxies. D) the concept laid down by the spiral density wave theory.
Suppose one's hand exerts a force of 12 N upward on a book weighing 10 N. The reaction to the force of the hand on the book is a force of
A. 2 N exerted by the book on the hand. B. 10 N exerted by the Earth on the book. C. 10 N exerted by the book on the hand. D. 10 N exerted by the book on the Earth. E. 12 N exerted by the book on the hand.
The rate at which work is done is equivalent to which of the following?
a. increase in potential energy c. potential energy b. thermal energy d. power