What is the brightest star in the sky other than the Sun?
Sirius, which has an apparent magnitude of –1.6.
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Which of these seems the best present answer to the horizon and flatness problems?
A) The superforce rules creation. B) Dark Energy speeds the universe on out to infinity. C) symmetry in creation of particles and antiparticles D) the inflationary epoch E) the GUT theory
What is not a main source of evidence for the existence of dark matter?
A) massive blue stars B) rotation curves of disk galaxies C) stellar motions in elliptical galaxies D) velocities and positions of galaxies in clusters of galaxies E) gravitational lensing by clusters of galaxies
You are studying a mystery companion to an evolved star, with mass transfer happening. Which of the following properties suggests that the companion is definitely a black hole?
A) The mystery companion has a mass of over 1.4 solar masses. B) The mystery companion has a mass of over 3 solar masses. C) The mystery companion has an X-ray emitting accretion disk. D) The mystery companion gives off periodic X-ray bursts.
Two identical lightbulbs are installed in two sockets connected in parallel and power is then applied to the combination so that both bulbs light. If one of the bulbs is then removed from its socket, the other one will
A. get dimmer. B. remain equally bright. C. go out. D. get brighter.