how can rockets go so high

Question: how can rockets go so high
- Keywords:
  rocket,
  space
Asked by paul and james to Áine, Ciarán, Eoin, Lydia, Victoria on 18 Nov 2014.
- Ciarán O'Brien answered on 18 Nov 2014:
  
  The fuel rockets use is really powerful stuff, and it produces a huge amount of power, which starts a rocket moving very fast. Most of a rocket is a fuel tank, and they burn it all up really quickly to get so high.
  
  As the rocket burns up fuel, it gets lighter (less fuel to carry), so it has to do less work to move itself as it gets higher.
  
  As a rocket gets higher, the earth’s gravitational pull gets weaker, so it has less to struggle against.
  
  All of these things make it easier for a rocket to get so high. Once it breaks free of the earth’s gravity, it can stay that high forever!
- Lydia Bach answered on 18 Nov 2014:
  
  Hey Paul and James,
  
  that’s because they are fuelled by rocket boosters, fuels like liquid or gas (in the case of a space rocket), but they don’t need air unlike jet engines we know.

Question: how can rockets go so high