You make a roundtrip to a star located 1000 light-years away (so the roundtrip distance is 2000 light-years in Earth's reference frame) at an average speed of 0.99c. Based on the time dilation formula below, about how long will the trip take, according to you?
t' = t
A) 2.8 years
B) 10 years
C) 28 years
D) 280 years
E) 2000 years
D) 280 years
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If the Moon's orbital plane was aligned with the celestial equator we could
a. have eclipses every month. b. never have eclipses. c. have eclipses only at solstice. d. have eclipses only at the equinoxes.
For what kinds of stars are the masses of stars in the H-R diagram "orderly"? For what kinds of stars are they disorderly? In other words, could you guess the mass of a star from its location (luminosity, temperature) on the H-R diagram?
What will be an ideal response?
Star clusters are important to our study of stars because
a. all stars formed in star clusters. b. the Sun was once a member of a globular cluster. c. they give us a method to test the our theories and models of stellar evolution. d. they are the only objects that contain Cepheid variables. e. All of the other choices are correct.
A proton with a kinetic energy of 0.20 keV follows a circular path in a region where the magnetic field is uniform and has a magnitude of 60 mT. What is the radius of this path?
A. 4.1 cm B. 2.9 cm C. 3.4 cm D. 5.1 cm E. 2.4 cm