Billionaire entrepreneur Elon Musk hopes to one day colonise Mars.
A private company has successfully launched a rocket into space from New Zealand, the first from a private launch facility.
These three things will change the world today.
One of the big worries for the future is that humans will destroy planet Earth, filling it up with rubbish and greenhouse gases, so that the planet is no longer habitable.
The surface of Mars has fascinated generations of science fiction writers.