What is thought to be the origin of enormous x-ray flares that occasionally come from the direction of Sgr A*?
A) x-ray binary systems that lie close to the galactic center
B) massive-star supernovae near the galactic center
C) comet-sized objects being torn apart by the tidal forces of the black hole near the galactic center
D) supernova shock waves plowing into dense regions of the interstellar medium near the galactic center
C) comet-sized objects being torn apart by the tidal forces of the black hole near the galactic center
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One limit on the age of the Universe is that it must be older than the oldest stars.
Answer the following statement true (T) or false (F)
All globular clusters in our Milky Way are about how old?
A) less than a million years B) ten-fifty million years old C) one to three billion years old D) around ten billion years old E) a variety of ages, from newly born to twenty billions years old
Spherical Mirrors: Single concave spherical mirrors produce images that
A. are always smaller than the actual object. B. are always larger than the actual object. C. are always the same size as the actual object. D. could be smaller than, larger than, or the same size as the actual object, depending on the placement of the object. E. are always real.
The metal in a chunk of copper or iron is composed of
A) crystals. B) non-crystalline fibers. C) amorphous particles. D) none of the above