Question : 93.Elliptical galaxies contain more gas, dust and young stars than : 1777271

93.Elliptical galaxies contain more gas, dust and young stars than do Sa galaxies.
94.Until recently, most astronomers thought elliptical galaxies were shaped like oblate spheroids.
95.Cepheid variable stars are more luminous than the sun.
96.The look-back time is numerically equal to the distance to a galaxy in light-years.
97.The rotation curve method can be applied only to pairs of galaxies orbiting each other.
98.Some large clusters of galaxies do not appear to contain enough mass to hold themselves together.
99.If H equals 50 km/sec/Mpc, then a galaxy with a radial velocity of 50,000 km/sec will have a distance of about 1 Mpc.
100.When two galaxies collide, they pass through each other and their stars almost never collide.
101.When a large galaxy collides with a small galaxy, the smaller galaxy may be pulled apart by tidal forces.
102.Poor clusters of galaxies often contain an excess of E and SO galaxies.