Space elevators have always been science fiction, but it may soon be possible to construct them. The concept existed for over a hundred years and experienced many different iterations. Nowadays, companies are beginning to research materials that could be used in a future space elevator.
Scientists from the European Space Agency discovered the evidence of an underground Martian lake full of water by using the Mars Express spacecraft. This may prove beneficial to future manned missions to Mars, but further research is necessary to determine the exact properties of this lake.