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___ is an irregular galaxy that is believed to have collided with the Milk Way and is expected to merge with the Milky Way in the future a - The Andromeda galaxy b - The Small Magellanic Cloud c - M87 d - The Virgo cluster e - The Antennae galaxy {Ans: b}According to the magnitude scale via Hipparchus, a fifth-magnitude star is a - fainter than fourth magnitude b - brighter than a fourth magnitude c - the brightest type of star d - the faintest type of star {Ans: a}Saturn's moon, whose gravitational effect causes ring gaps a - enceladus b - ganymede c - titan d - mimas {Ans: d}The supermassive black hole at the center of the galaxy is estimated to be a - 4 solar masses b - 4 thousand solar masses c - 4 million solar masses d - 4 billion solar masses {Ans: c}Jupiter Moons a - Io and Europa b - Titan and Mimas c - Triton and Calliso d - Ganymede and Callisto e - a and d f - b and d g - a and c {Ans: e}halo a - all material confined to