Neutron stars must ____
a. rotate very rapidly
b. be very luminous
c. have weak magnetic fields
d. have a mass greater than three solar masses
e. have about the same surface temperature as the star that created them
a
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The Jovian planets formed beyond the _______________, where water vapor, methane, and ammonia could freeze to form ice particles
Fill in the blank(s) with correct word
What happens when a planet passes in front of its star (i.e. between the star and us)?
a) The star increases in brightness and the star moves away from us b) The star increases in brightness and the star moves towards us c) The star decreases in brightness and the star moves towards us d) The star does not change in brightness or move relative to us e) The star decreases in brightness and the star moves away fromus
Deuterium and helium could be made only during the nuclear epoch
Indicate whether the statement is true or false
A proton moves around a circular path (radius = 2.0 mm) in a uniform 0.25-T magnetic field. What total distance does this proton travel during a 1.0-s time interval? (m = 1.67 × 10^?27 kg, q = 1.6 × 10^?19 C)
a. 82 km b. 59 km c. 71 km d. 48 km e. 7.5 km