You hear people panicking about climate change. But what about direct heating? Even if there was no climate change, our energy use still matters depending on how many people live on the planet.
The Mars 2020 mission involves sending a rover, named Perseverance, to Mars to look for evidence of past life on that planet. Perseverance will collect samples of 3 billion year old rocks that scientists on Earth think might contain signs of ancient life on Mars. Later, NASA will launch a mission to retrieve those…