Good Riddles

Question: What comes down and never goes up?

Question: What can you see from space that you can't see from Earth?

Question: At work a lady is requested to move a 2 ton machine with out any assist.How is she able to move the item?

Question: I fasten to walk,
and unfasten to stop.

What am I?

Question: I can pogo on the moon, but not Mars. I can pogo on this table, but not on a stick. What can assure us to be able to pogo on objects at all times?