People somewhere on Earth experience a sequence of two or three eclipses of various sorts in January and February. When will people next have an opportunity to see eclipses?
What will be an ideal response?
in about 6 months
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Galaxies in all directions appear to be redshifted, as if rushing away from us in the center of the universe. How does the cosmological principle handle this problem?
What will be an ideal response?
Enormous filaments of excited gas arching over the Sun's surface and extending hundreds of thousand of kilometers outward are called
a. sunspots. b. solar flares. c. prominences. d. coronal arcs.
Plane Mirrors: Two plane mirrors make an angle of 30° with each other. A light ray enters the system and is reflected once off of each mirror. Through what angle is the ray turned?
A. 60° B. 90° C. 120° D. 150°
The Doppler radial velocity technique works best for:
A) planets whose orbits are along our line of sight. B) planets whose orbits are perpendicular to our line of sight. C) planets whose orbits are nearly circular. D) planets whose orbits are very eccentric.