7. What is the technical name for a star family that formed at the same time from a single cloud of gas? a) Nuclear family b) Galaxy c) Star Cluster d) Constellation

Why are we unlikely to find Earth-like planets around halo stars in the Galaxy? A. Halo stars formed in a different way from disk stars. B. Planets around stars are known to be extremely rare. C. Halo stars formed in an environment where there were few heavy elements to create rocky planets. D. Halo stars do not have enough mass to hold onto planets. Is the answer C? Since halo stars are formed early when the galaxy consisted of mainly hydrogen and helium, there are no heavier elements available to create Earth-like planets so just halo stars are formed?  Thanks!

What evidence is there that star formation has occurred recently?

Another explanation for the Universe is the Steady State Hypothesis. The Steady State Hypothesis says that the Universe has always existed and is infinite in extent. Which of the following supports the Big Bang Theory and which supports the Steady State Model. (Select B-Big Bang Theory, S-Steady State Model, If the first is B and the rest S, enter BSSSSS). A) An observation that some globular clusters show M-type stars that have evolved off the main sequence.   B) The measurement of redshifts that show galaxies appear to be moving away from each other and the Universe is expanding.   C) A measurement that shows the density of the Universe is close to the critical density.   D) The measurement of the microwave background radiation.   E) Observing that galaxies at very large distances look identical to those in the nearby universe.