In Robert Frost's classic poem, when he ends with ice will suffice, the universe is:
A) closed.
B) critical density.
C) open.
D) Euclidean.
E) Relativistic.
Question 2
X-ray bursters occur in binary star systems. The two types of stars that must be present to make up such an object are:
A) a white dwarf and a neutron star.
B) a contact binary system of two red giants.
C) a white dwarf and a main sequence star.
D) a main sequence or giant star and a neutron star in a mass transfer binary.
E) two neutron stars in a mass transfer binary.