All RR Lyrae stars have about the same
A) distance of 32 light-years.
B) period of six days.
C) locations in the centers of globular star clusters.
D) luminosity of about 100 Suns.
E) galactic location and speed.
D
You might also like to view...
The inductance of a tuning circuit of an AM radio is 4.00 mH. Find the capacitance of the circuit required for reception at 1200 kHz
a. 2.10 pF b. 4.40 pF c. 21.2 pF d. 43.4 pF e. 27.6 pF
The general geologic term for the downslope movement of soil and rock under the influence of gravity is
a. mass wasting. b. slump. c. creep. d. landslide.
Consider the following circuits. Two identical batteries are connected to two identical inductors as shown. The switches are closed for a very long time
A giant star in another galaxy exploded 67 million years ago, forming a supernova. The event is observed by an astronomer on Earth
Estimate the speed at which the supernova (and its galaxy) recedes from Earth if the Hubble constant is 22 km/s per million light-years. (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s) A) 4700 km/s B) 2700 km/s C) 1500 km/s D) 1200 km/s E) 670 km/s