Designed to last 100 missions.
Multiple space shuttle orbiter vehicles are necessary to meet launch schedules. While reusable, each orbiter requires 6-9 months of refurbishment and processing before it is ready for the next mission. NASA refers to this as the "flow"
the last nasa launched a space shuttle was on march 18
You might find the answer at Nasa's website.
6 to 8.5 hours during space walk
National Aeronautics of Space Administration - The very long version of NASA!
discovery
Mariner 2 (Nasa fly-by) Venera 2 (USSR fly-by) Venera 3 (USSR landing, destroyed in atmosphere upon landing) Venera 4 (USSR probe landing) Mariner 5 (Nasa fly-by) Venera 6 (USSR probe landing) Venera 7 (USSR probe landing) Venera 8 (USSR landing) Mariner 10 (Nasa fly-by on way to Mercury) Venera 9 (USSR orbiter and landing) Venera 10 (USSR orbiter and landing) Pioneer Venus 1 (NASA orbiter) Pioneer Venus 2 (4 separate NASA probes) Venera 12 (USSR lander and orbiter) Venera 11 (USSR lander and orbiter) Venera 13 (USSR lander and orbiter) Venera 14 (USSR lander and orbiter) Venera 15 (USSR orbiter) Vega 1 (USSR probe and Comet Halley flyby) Vega 2 (USSR probe and Comet Halley flyby ) Galileo (NASA fly-by on way to Jupiter)
Mariner 2 (NASA fly-by) Venera 2 (USSR fly-by) Venera 3 (USSR landing, destroyed in atmosphere upon landing) Venera 4 (USSR probe landing) Mariner 5 (Nasa fly-by) Venera 6 (USSR probe landing) Venera 7 (USSR probe landing) Venera 8 (USSR landing) Mariner 10 (Nasa fly-by on way to Mercury) Venera 9 (USSR orbiter and landing) Venera 10 (USSR orbiter and landing) Pioneer Venus 1 (NASA orbiter) Pioneer Venus 2 (4 separate NASA probes) Venera 12 (USSR lander and orbiter) Venera 11 (USSR lander and orbiter) Venera 13 (USSR lander and orbiter) Venera 14 (USSR lander and orbiter) Venera 15 (USSR orbiter) Vega 1 (USSR probe and Comet Halley flyby) Vega 2 (USSR probe and Comet Halley flyby ) Galileo (NASA fly-by on way to Jupiter)
Multiple space shuttle orbiter vehicles are necessary to meet launch schedules. While reusable, each orbiter requires 6-9 months of refurbishment and processing before it is ready for the next mission. NASA refers to this as the "flow"
== == The Cassini space orbiter was part of the Cassini-Huygens mission, a collaborative NASA/ESA/ASI unmanned space mission for the purpose of studying Saturn and its moons.
the last nasa launched a space shuttle was on march 18
Yes, NASA has sent a couple of unmanned probes to examine Mercury, Mariner 10 which did a flyby and the MESSENGER orbiter.
You might find the answer at Nasa's website.
6 to 8.5 hours during space walk
NASA sent a probe to the moon in 2009 which, among other things, took pictures of each of the Apollo landing sites. Searching NASA for Lunar Reconnaissance Orbiter images should yield the images in question.
National Aeronautics of Space Administration - The very long version of NASA!
NASA