Closest, would be the Andromeda galaxy — on a collision course with our Milky Way. And in all directions thereafter, an estimated 125 to 200 billion additional (observable) galaxies, each with 100 to 600 billion stars each — some of the largest comprised of 1 trillion stars or more. read more
Describe our solar system as just one tiny part of the Milky Way galaxy and the universe beyond. List two tools that help in the exploration for other planets. Explain several ways in which engineers help advance the exploration of the universe. read more