If you were to divide the presentday universe into cubes whose sides are 10 million lightyears long, each cube would contain, on average, about one galaxy similar in size to the Milky Way. Now suppose you travel back in time, to an era when the average distance between galaxies is 0.24 of its current value, corresponding to a cosmological redshift z= 2.7. How many galaxies similar in size to the Milky Way would you expect to find, on average, in cubes of that same size?

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

What is the mass of the same rock on the earth

Scout feels ill one day before school. her mother puts a thermometer in her mouth and the temperature begins to climb to 100°f. what is happening between the cooler thermometer and scout's body? a) scout's body is applying a force to the particles in the thermometer. b) kinetic energy is being transferred from her mouth to the thermometer. c) potential energy is being lost by the thermometer and gained by scout's body. d) the potential energy stored in foods is converted to mechanical energy to raise the mercury in the thermometer.