A disk of gas, dust, and ice collapsed some 4.5 billion years ago, creating the Sun, the planets, their moons, and the remainder of the Solar System. After a few million years, molten masses of matter started to cool and solidify into rocky planets. About this early period of Earth’s planetary evolution, we know virtually little. Finding rocks that old is extremely difficult due to erosion and plate tectonics. We are interested in learning more about the formation and evolution of planets because it will enable us to comprehend why Earth is so unique compared to other worlds. Space agencies are sending a multitude of probes and rovers to Mars to investigate its geological past in order to understand more about the origin of planets. Many people believe that Mars and Earth are siblings. It once supported liquid water, generating lakes and seas, and it also witnessed protracted volcanic activity. The old rocks on Mars, however, are better preserved than those on Earth since there is no plate tectonics and minimal recent erosion. The collection of samples from one specific area and their subsequent return to Earth for study is one of the main goals of the next Mars missions. But we already have some Martian materials that we can examine in-depth. Across the past 30 years, there have been extensive studies conducted on the 300 meteorite bits of Mars that are currently housed in laboratories all over the world. Over the last 20 million years, about a dozen asteroid strikes have caused these meteorites to be ejected from the surface of Mars. However, it is unknown where exactly the only Martian rocks found on Earth came from.
18 hours ago
18 hours ago