These are images of Mars, courtesy of the Mars Reconnaissance Orbiter. On this spacecraft is a powerful camera known as HiRISE. It’s been sending us detailed images of Mars similar to our own “Google Earth”.
What stands out to me is the staggering level of diversity and beauty. Mars is a dead planet, but it clearly had lots going on once. How does a planet die?
The answer is simpler than you might have thought. If you make a large cup of tea and a small cup of tea, wait fifteen minutes and taste each cup. You’ll notice the large cup is warmer than the smaller one. Small things lose heat faster than large ones.
The surface of Mars has been blasted by the Sun’s solar wind for a long time. The shield against such a thing comes from the same concept as what keeps a cup of tea hot. When Mars had a hot interior, it’s iron core was liquid metal and spinning. This generates a magnetic field.
The solar wind is simply charged particles, subject to magnetism. On Earth, our magnetic field blocks their access to the Earth’s surface, protecting us.
Earth is larger than Mars, and has thus kept it’s interior heat more efficiently.
Mars is a fossil. It was once a living planet with lots of liquid water. These pictures make that clear and ground science confirms it. It was however once more likely to house life, it seemingly may have been quite hospitable.
Is it possible to bring Mars back to life? Certainly humans can colonize it with massive industrial protections against the radiation. This would be expensive and difficult. Some however bring up the question of changing the planet so we don’t need to live in artificial environments.
Could we actually bring Mars back to life?
P.S. If you look carefully at the top right image, you’ll see a blue area… that’s the Curiosity Rover right after landing.
NASA’s MAVEN Mars orbiter’s capability to relay data from a Mars surface mission, on Nov. 6, 2014, included this and other images from NASA’s Curiosity Mars rover. The image was taken Oct. 23, 2014, by Curiosity’s Navigation Camera, showing part of “Pahrump Hills” outcrop.