Marvelous Things About Planet Earth

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Marvelous Things About Planet Earth

By Trista - September 9, 2019

2. Earth has one moon and two co-orbital satellites.

While many people know and understand that the Earth has one moon, did you know that two additional asteroids are locked into co-orbital orbits with Earth? People call them 3753 Cruithne and 2002 AA. They belong to a larger population of asteroids — Near-Earth Objects (NEOs). Scientists also refer to them as Earth Trojans. Experts sometimes call the asteroid 3753 Cruithne is as Earth’s second moon. But it doesn’t actually orbit the Earth but is even following its own distinct path around the sun. However, 2002 AA is making a horseshoe orbit around the Earth that brings it close to the planet every 95 years.

Other small, natural objects in orbit around the sun may enter orbit around Earth for a short period, making them temporary natural satellites until they exit our orbit. The only confirmed examples of this have been 2006 RH120 during 2006 and 2007 and 2020 CD3 between 2018 and 2020. There are also objects called “quasi-satellites.” The difference between them and standard satellites is that the orbit of a satellite of Earth depends on the Earth-Moon system’s gravity. In contrast, the quasi-satellite’s trajectory would not change if the Earth-Moon system were removed because it is orbiting the sun.

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1. The world boasts several million species of life, living in habitats from the bottom of the deepest ocean to a few miles from the atmosphere.

While there has been past discovered evidence of water and organic molecules on Mars and building blocks of life on Saturn’s moon, Titan, Earth is the only known planet to have life. Scientists have speculated about the possible existence of life beneath the icy crust of Jupiter’s moon Europa and Saturn’s moon Titan. As we’ve discussed, scientists have even looked for other planets that look like they could support similar life forms, perhaps in some search of connection. They also look for chemical combinations that could signal alien life: carbon, nitrogen, oxygen, phosphorous, sulfur, and hydrogen.

However, Earth remains the only confirmed place of life. Scientists are building experiments that will help find life on other planets if it exists. For instance, giant radio dishes currently scan distant stars, listening for intelligent life’s characteristic signals reaching out across interstellar space. NASA’s entire exoplanet program is to find life signs on a planet other than Earth, though this could take decades if not longer. One promising landmark in the search is the James Webb Space Telescope, launching this year! The Webb will be the largest, most powerful space telescope ever built and launched into space. Scientists hope that it could pick up signs of an atmosphere like ours, so keep your fingers crossed!

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