What are wormholes? What causes black holes? How are black holes and white holes different? Can people travel in time and across space? Where would you go if you could time travel?
Are there white holes in space? Who said space and time are the same? Why do wormholes exist? How fast does light travel? What if you could time travel?
Scientists want to know more about comets. They decide to catch one. A spacecraft travels for ten years to reach the comet. What will scientists learn from the mission?
