Which of the following is most like the rotation of stars in the disk of the milky way?
the planets in our solar system
cars moving at a constant speed on a circular race track
a dvd in a player
the tire of a car moving

Cars moving at constant speed on a circular race track

Explanation:

Stars and gas in the galactic disk moves in a roughly circular path about the center of the galaxy

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask