In general, the less cratered a moon's surface, the ________ it is
Fill in the blank(s) with correct word
younger
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The umbra of the moon's shadow is the region from which no part of the photosphere is visible
Indicate whether the statement is true or false
Graphical Addition: Two vectors, of magnitudes 20 mm and 50 mm, are added together. Which one of the following is a possible value for the magnitude of the resultant?
A. 10 mm B. 20 mm C. 40 mm D. 80 mm
A package of supplies is dropped from a plane, and one second later a second package is dropped. Neglecting air resistance, the distance between the falling packages will
A) be constant. B) decrease. C) increase. D) depend on their weight. E) depend on the speed of the plane.
How did Mr. Hubble calculate the age of the universe?
A) by measuring the rate of expansion of the universe B) by looking at the age of the oldest stars C) by measuring the redshift of stars within 360 degrees of the center of our galaxy D) by measuring the rate of radioactive decay within the farthest galaxies