21.   On Wednesday, Mission Control ordered the astronauts to steer into a higher orbit to avoid a tool accidentally lost by a spacewalking astronaut over the weekend.

22.   Rockets on the service module will boost the station into a higher orbit.

23.   The crew also will try to boost the telescope to a slightly higher orbit to make up for its natural, gradual decline in altitude.

24.   The shuttle pilots also gave the station a final lift to a higher orbit, while others on board installed new parts in the station treadmill.

25.   The shuttle visitors also left the space station in a much higher orbit.

26.   They also gave the station a lift to a higher orbit.

27.   After performing the upgrades, the shuttle is scheduled to boost the Hubble to a higher orbit, giving it a longer life in space.

28.   After finishing work on the telescope, the shuttle is to boost the Hubble into a higher orbit, which should give it a longer lifespan.

29.   After performing other upgrades, shuttle is scheduled to boost the Hubble to a higher orbit, giving it a longer life in space.

30.   After performing other upgrades, shuttle will boost the Hubble to a higher orbit and a longer life in space.