It doesn’t actually orbit the Earth, but has a synchronized orbit with our home planet. We won’t go into too much detail about the Moon, I’m sure you’ve heard all about it.ģ753 Cruithne is 5 km across, and sometimes called Earth’s second moon. But did you know there are 2 additional asteroids locked into a co-orbital orbits with Earth? They’re called 3753 Cruithne and 2002 AA29. Earth has 1 moon and 2 co-orbital satellitesĪs you’re probably aware, Earth has 1 moon (The Moon). That’s why we tack on an extra day in February every year divisible by 4 – 2004, 2008, etc – unless it’s divisible by 100 (1900, 2100, etc)… unless it’s divisible by 400 (1600, 2000, etc). 2564 days that creates the need for leap years. You’d think that time would add up, day by day, and within a few months, day would be night, and night would be day. Now wait a second, that means a day is 4 minutes shorter than we think it is. This is the amount of time it takes for the Earth to completely rotate around its axis astronomers call this a sidereal day. It’s actually 23 hours, 56 minutes and 4 seconds. Earth doesn’t take 24 hours to rotate on its axis 47% of the Earth’s crust consists of oxygen. If you could actually get down and sample the core, it would be 88% iron. Of course, most of this iron is actually down at the core of the Earth. If you could separate the Earth out into piles of material, you’d get 32.1 % iron, 30.1% oxygen, 15.1% silicon, and 13.9% magnesium. Earth is mostly iron, oxygen and silicon The remaining 30% is the solid ground, rising above sea level. 70% of our planet is covered with oceans. When astronauts first went into the space, they looked back at the Earth with human eyes for the first time, and called our home the Blue Planet. 70% of the Earth’s surface is covered in water The average density of the Earth is approximately 5.52 grams per cubic centimetre.Įarth distance from the Sun and orbital eccentricity This varies according to the part of the planet for example, the metallic core is denser than the crust.
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