Smart Rocks are considered for
A. geologic dating
B. ballistic missile defense
C. nuclear power
D. solar power
Ans: B. ballistic missile defense
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Why do molecular bands only occur in the spectra of the coolest stars?
What will be an ideal response?
The amount of gravitational force that acts on a space vehicle while in Earth orbit is
A) nearly zero. B) nearly as much as the vehicle's weight on Earth's surface. C) the same as the vehicle's weight on Earth's surface.
How does the interstellar medium obscure our view of most of the galaxy?
A) The small mixture of dust grains in the interstellar medium absorbs visible light. B) Dust reflects most light from distant regions of the galaxy back towards the source. C) Hydrogen gas produces so much visible light that the interstellar medium is opaque, blocking our view of anything beyond it. D) Molecules in the interstellar medium absorb all wavelengths of light. E) all of the above
All stars are born with the same basic composition, yet stars can look quite different from one another. Which two factors primarily determine the characteristics of a star?
A) its mass and its stage of life B) its apparent brightness and its distance C) its age and its location in the galaxy D) its mass and its surface temperature E) its apparent brightness and its luminosity