9 STASHED IDEAS
Imagine that you are flying your drone on a planet 180 million kilometres away. It takes 20 minutes for your command to reach the planet – and the pictures you see of what is happening are 20 minutes old. You cannot take evasive or corrective action if anything goes wrong, it would take too late. This is the type of situation that the NASA's engineers did not wish to experience on the first flight of the "Ingenuity" helicopter on Mars on April 19.
Physicists’ current understanding of spacetime comes from Albert Einstein’s theory of General Relativity . General Relativity states that space and time are fused and that nothing can travel faster than the speed of light. General relativity also describes how mass and energy warp spacetime – hefty objects like stars and black holes curve spacetime around them.
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