Which of the following factors was very important to the decision to classify Pluto as a dwarf planet rather than a "regular" planet?
A) its small size and mass
B) its large distance from the Sun
C) its composition of ice and rock
D) its relatively large moon, Charon
A) its small size and mass
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By which of the following characterisitcs is a desert defined?
a. High winds b. High temperature c. Lack of precipitation d. Hot days and cold nights
On the celestial sphere, the Sun
A) circles once each year along the path called the ecliptic. B) stays always at the same fixed point among the stars. C) circles daily around the celestial equator. D) is the central object.
The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively. An object is placed at 0
30 cm from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain (with the eye focused at the far point). The near point of the person using the microscope is 25 cm and the far point is at infinity. What is the final overall magnification of the microscope? A) -320 x B) -470 x C) -240 x D) -300 x E) -190 x
How can astronomers determine the mass of the Sun?
What will be an ideal response?