K
( planned / may / the next ten / to / able / the future, / astronauts / land / on Mars / with / be / to / within / more projects / for / twenty years ).
With more projects planned for the future, astronauts may be able to land on Mars within the next ten to twenty years.
( live / will / be / for / it / to / humans / possible / on / Mars )?
Will it be possible for humans to live on Mars?
( to / biggest / challenges / build / get / one / the / of / be / to / will / living facilities / materials / there ).
One of the biggest challenges will be to get materials to build living facilities there.
( far / transporting / will / be / Earth / from / heavy construction materials / too / expensive ).
Transporting heavy construction materials from Earth will be far too expensive.
( this idea / the best way / construct / NASA's contest / won / for / to / buildings / on Mars ).
This idea won NASA's contest for the best way to construct buildings on Mars.
( time / do / money / so / much / spend / and / why / on / countries / space exploration )?
Why do countries spend so much time and money on space exploration?
( our life and society / in / space research / can / unexpected / benefit / ways ).
Space research can benefit our life and society in unexpected ways.
( average / degrees / on / the planet / 500 / temperatures / Celsius ).
Temperatures on the planet average 500 degrees Celsius.
( knows / of Mars / no one / space exploration / and beyond / make / practical contributions / what / can / to our future ).
No one knows what practical contributions space exploration of Mars and beyond can make to our future.