We just learned about the Spacecraft Magnetometer.
Another rocket guidance tool is an Airspeed Indicator.
When the rocket is blasting through the air, it can use this tool to figure out how fast it is going.
The Airspeed Indicator uses something called a pitot tube (pronounced PEE-toh) which is a tube that has some liquid in it.
As the rocket flies along the air flowing into the pitot tube puts pressure on the liquid, and the airspeed indicator uses that pressure to measure how fast the rocket is going.
If it is going very fast, there will be a lot of pressure.
(from: wikipedia - airspeed indicator)
Kid Facts - Blast from the past: Hypocenter
