How fast do you have to be travelling to enter the Earth’s atmosphere?

Question: How fast do you have to be travelling to enter the Earth's atmosphere?
- Keywords:
  atmosphere,
  earth,
  speed,
  travel
Asked by Theo to Andrea, Charlie 🚀, Col Op, Kirsty, Vinita on 15 Jun 2016.
- Andrea Boyd answered on 15 Jun 2016:
  
  Thanks to gravity, it doesn’t matter how fast you’re going, you’ll reenter! The angle of entry makes all the difference – get that right and have good heat shields or burn up.

Question: How fast do you have to be travelling to enter the Earth's atmosphere?