These graphics show the paths of the Delta II rockets for MER-A and MER-B
during the ascent phase of
the mission. Items shown are major staging events as the rocket ascends
through the atmosphere, reaches orbit, and accelerates the spacecraft
fast enough to escape Earth's gravity. Tracking stations at various
points around the globe listen for the launch vehicle's signals to
determine how fast it is going and if it is on course. Click the
circles on the maps to learn more.