The plane in which almost all planets orbit the Sun is called the:
A) equator of the solar system.
B) ecliptic.
C) equant.
D) node.
E) galactic plane.
B
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Tiny amounts of lithium and beryllium were formed in the big bang
a. True b. False Indicate whether the statement is true or false
A scientific theory can be proven true if the correct experiments are performed
a. True b. False Indicate whether the statement is true or false
Poor clusters
a. contain more than 1000 stars and are found in the halo of the galaxy. b. contain lots of young stars and are found in the disk of a spiral galaxy. c. contain more than 1000 galaxies and are generally elliptical in shape. d. contain fewer than 1000 galaxies and tend to be irregularly shaped. e. are found in the nucleus of the galaxy.
A star is observed with a surface temperature of 3000 K and a luminosity of 10?3 times that of the Sun. Based on the H-R diagram shown above, what is the approximate radius of this star?
A) 0.1 solar radius B) 0.5 solar radius C) 1 solar radius D) The radius cannot be determined.