What is the closest thing to a binary planet we find in the solar system? Why?
What will be an ideal response?
Pluto's moon Charon is half as big as Pluto, and both objects are tidally fixed to always face each other during their 6.4 day rotations.
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The weight of a body on the Moon is _______________ the weight of the same body on Earth
Fill in the blank(s) with correct word
Atmospheric refraction of light rays is responsible for
a. spherical aberration. b. mirages. c. chromatic aberration. d. light scattering.
According to the Zeeman effect, the splitting of a sunspot's spectral lines is due to
A) their magnetic fields. B) a Doppler shift. C) temperature variations. D) their rapid rotation. E) their radial velocity.
There are 640 acres in a square mile, and 5280 feet in one mile. What is the length in feet (to the nearest foot) of the side of a square having an area of one acre?
A) 660 feet B) 209 feet C) 165 feet D) 412 feet E) 435 feet