The right answer for the question that is being asked and shown above is that: "A. neutron; B. red giants; C. black holes; E. main sequence." The Chandra X-ray observatory is BEST equipped to search for neutron, red giants, black holes, <span>main sequence.</span>
If you want the BEST, then you only get one of them. If there were two different BESTs, then we would have to decide whether one best is bester than the other best or whether they're both equally best.
Red giants, white dwarfs, and main sequence stars are not particularly strong emitters of X-rays, but they do emit lots of other stuff that makes them easy to find.
Black holes don't emit anything, so no matter what kind of detector you're using, they're tough to find.
Neutron stars are strong emitters of X-rays and not much else. So an X-ray detector is just the thing to use to find them.
It traveled 200 m in 50 seconds. 200/50 can be simplified to 4 m/s! The velocity is -4 m/s (negative because it travelled from 100 to -100 or backwards)
