Which object would be absent in the galactic halo?
a. emission nebulae
b. old main sequence stars
c. red giants
d. white dwarfs
e. Cepheid variables
a
Physics & Space Science
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Astronomers estimate that the age of the Solar System is about ________ years.
A. 4.6 billion B. 4.6 million C. 4.6 trillion D. 13.7 billion
Physics & Space Science
To save energy while you leave your cool house for a half hour on a hot day, turn the temperature setting on the air conditioner
A) down. B) up. C) off altogether. D) to room temperature.
Physics & Space Science
At what angle should a water-gun be aimed in order for the water to land with the greatest horizontal range?
A) 45° B) 30° C) 0° D) 90° E) ? radians
Physics & Space Science
The balance between electrical and nuclear strong forces is more tenuous in
A) light elements. B) middle size elements like iron. C) heavier elements. D) all of the above E) none of the above
Physics & Space Science