missions是什么意思？

In early space programs, such as the Apollo missions of the 1960s and 1970s, and in the Space Shuttle missions today, scientists developed objects for the astronauts to use on the moon and in space.

Much of it was left by American astronauts who landed on the lunar surface between 1969 and 1972 during NASA's Apollo missions.

The equipment stayed there after its missions ended.

The other rubbish comes from missions that did not have human cruise.

These missions were conducted by various space exploring agencies including those from the US, Russia, Japan, India and Europe.

There was no grand follow-up to the Apollo missions.

The man is well informed about the space shuttle missions.

Multiples can be deployed in combination for more complex missions than could be achieved by one CubeSat alone.

They're primarily designed for Low Earth Orbit(LEO) an easily accessible region of space from around 200 to 800 miles above Earth, where human-tended missions like the Hubble Space Telescope and the International Space Station(ISS) hang out.