How are rockets launched into space?

If you’re trying to get to another planet, you’ll need a fast-moving rocket to overcome Earth’s gravity. To do that, you’d have to speed up to around 25,000 mph. But you’ll also need to figure out the best time to leave Earth to get to that planet.

For example, Mars and Earth reach their closest distance to each other about every two years. This is the best time to go to Mars, since it requires the least amount of propellant and time to get there. But you’ll still need to launch your rocket at the right time to make sure the spacecraft and Mars arrive at the same place at the same time.

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