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EARTH🌍
The Earth’s rotation is gradually slowing.
This deceleration is happening almost imperceptibly, at approximately 17 milliseconds per hundred years, although the rate at which it occurs is not perfectly uniform. This has the effect of lengthening our days, but it happens so slowly that it could be as much as 140 million years before the length of a day will have increased to 25 hours.
The Earth was once believed to be the centre of the universe.
Due to the apparent movements of the Sun and planets in relation to their viewpoint, ancient scientists insisted that the Earth remained static, whilst other celestial bodies travelled in circular orbits around it. Eventually, the view that the Sun was at the centre of the universe was postulated by Copernicus, though this is also not the case.
Earth has a powerful magnetic field.
This phenomenon is caused by the nickel-iron core of the planet, coupled with its rapid rotation. This field protects the Earth from the effects of solar wind.
There is only one natural satellite of the planet Earth.
As a percentage of the size of the body it orbits, the Moon is the largest satellite of any planet in our solar system. In real terms, however, it is only the fifth largest natural satellite.
Earth is the only planet not named after a god.
The other seven planets in our solar system are all named after Roman gods or goddesses. Although only Mercury, Venus, Mars, Jupiter and Saturn were named during ancient times, because they were visible to the naked eye, the Roman method of naming planets was retained after the discovery of Uranus and Neptune.
The Earth is the densest planet in the Solar System.
This varies according to the part of the planet; for example, the metallic core is denser than the crust. The average density of the Earth is approximately 5.52 grams per cubic centimetre.
Earth Diagrams
Earth size compared to the Moon
Earth size compared to the Moon
Earth distance from the Sun
Earth distance from the Sun and orbital eccentricity
Facts from Leo:
-70% of the Earth’s surface is covered in water
-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. And it’s no surprise. 70% of our planet is covered with oceans. The remaining 30% is the solid ground, rising above sea level.
-Earth is mostly iron, oxygen and silicon
-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. Of course, most of this iron is actually down at the core of the Earth. If you could actually get down and sample the core, it would be 88% iron. 47% of the Earth’s crust consists of oxygen.
-Earth doesn’t take 24 hours to rotate on its axis
-It’s actually 23 hours, 56 minutes and 4 seconds. This is the amount of time it takes for the Earth to completely rotate around its axis; astronomers call this a sidereal day. Now wait a second, that means a day is 4 minutes shorter than we think it is. 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.
-A year on Earth isn’t 365 days
-It’s actually 365.2564 days. It’s this extra .2564 days that creates the need for leap years. 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).
-Earth has 1 moon and 2 co-orbital satellites
-As you’re probably aware, Earth has 1 moon (The 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. We won’t go into too much detail about the Moon, I’m sure you’ve heard all about it.
3753 Cruithne is 5 km across, and sometimes called Earth’s second moon. It doesn’t actually orbit the Earth, but has a synchronized orbit with our home planet. It has an orbit that makes it look like it’s following the Earth in orbit, but it’s actually following its own, distinct path around the Sun.
2002 AA29 is only 60 meters across, and makes a horseshoe orbit around the Earth that brings it close to the planet every 95 years. In about 600 years, it will appear to circle Earth in a quasi-satellite orbit. Scientists have suggested that it might make a good target for a space exploration mission.
-The Earth is not actually round in shape; in fact it is geoid. This simply means that the rounded shape has a slight bulge towards the equator. So what causes this geoid shape? This happens solely because the rotation of the Earth which causes the bulge around the equator.
-The Earth tilts at roughly 66 degrees.
-Only 3% water of the earth is fresh, rest 97% salted. Of that 3%, over 2% is frozen in ice sheets and glaciers. Means less than 1% fresh water is found in lakes, rivers and underground.
-Asia Continent is covered 30% of the total earth land area, but represent 60% of the world’s population.
-Each winter there are about 1 septillion (1, 000, 000, 000, 000, 000, 000, 000, 000 or a trillion trillion) snow crystals that drop from the sky.with scientific wonder and spectacular beauty. It also, is capable of some pretty cool things that you may not have even known! Below, check out ten of the coolest things we learned about Planet Earth!
1. Earth is 4.5 Billion Years Old
How do we know this? In order to find out the age of the Earth, scientists look at rock and sediment and try to determine the age of that piece of sediment. It's not as easy as one may think, however. The processes of plate tectonics mean that the Earth is constantly recycling its rock, breaking it down into magma in the interior before pumping it back up to the surface once more. The oldest rock they've discovered comes from Austrialia, and is the basis for scientists estimations for Earth's age. 4.5 Billion years old, that's a lot of birthday cake!
2. One Year on Earth Isn't 365 Days
It’s actually 365.2564 days. It’s this extra .2564 days that creates the need for a Leap Year once every four years. That’s why we tack on an extra day in February every four years – 2004, 2008, 2012, etc. The exceptions to this rule is if the year in question is divisible by 100 (1900, 2100, etc), unless it divisible by 400 (1600, 2000, etc).
3. The Many Moons of Earth?
Technically, the Earth has just a single moon. However, Earth has two orbitals called 3753 Cruithne and 2002 AA29, which are part of a larger population of asteroids known as Near-Earth Objects (NEOs). The asteroid known as 3753 Cruithne measures 5 km across, and is sometimes called “Earth’s second moon”. It doesn’t actually orbit the Earth, but has a synchronized orbit with our home planet. It also has an orbit that makes it look like it’s following the Earth in orbit, but it’s actually following its own, distinct path around the Sun.
4. Antarctica
Did you know Antarctica is actually considered a desert? Inner regions get just 2 inches (50 millimeters) of precipitation a year (typically as snow, of course). Despite Antartica's desert-like climate, it also contains 70% of the Earth's freshwater and 90% of the Earth's ice!
5. Earth Has a Lead Foot
The Earth moves around the Sun at 67,000 miles per hour. Try clocking that on a police radar gun!
6. Did You Know Rocks Can Walk?
In Racetrack Playa in Death Valley, rocks sometimes weighing tens or hundreds of pounds, appear to walk! Scientists believe it's due to ice-encrusted rocks getting inundated by meltwater from the hills above the playa, according to NASA researchers. The meltwater causes the sand beneath to become a bit of a water slide, and when a nice breeze kicks up--the rock ... is rolling (or sliding as the case may be).
7. The World's Longest Mountain Range is Actually Underwater
To find the world's longest mountain range you'd have to look down, way down. The mid-ocean ridge is an immense volcanic mountain chain that encircles the planet beneath the sea — the chain is more than 30,000 miles (48,000 kilometers) long and rises an average of 18,000 feet (5.5 kilometers) above the seafloor. This is the spot where Earth's plates spread apart as new crust bubbles up — causing much of the earth's volcanic eruptions.
8. Earth Used to be Purple
According to this article from Live Science ancient microbes might have used a molecule other than chlorophyll to harness the sun's rays, one that gave the organisms a violet hue. The article posits that chlorophyll appeared after another light-sensitive molecule called retinal was already present on early Earth. Retinal, today found in the plum-colored membrane of a photosynthetic microbe called halobacteria, absorbs green light and reflects back red and violet light, the combination of which appears purple. The idea may explain why even though the sun transmits most of its energy in the green part of the visible spectrum, chlorophyll absorbs mainly blue and red wavelengths
9. The Earth Recycles Itself
Did you know that Earth is the only planet in our Solar System that has plate techtonics? The outer crust of the Earth has multiple regions called tectonic plates. Beneath that is a magma interior which causes the plates to move, occasionally crashing into one another. As they collide and pull apart, magma bubbles up and creates fresh crust to form.
This important process creates earth quakes volcanic eruptions, mountain formation, and ocean trenches. But also is part of the carbon cycle, in which microscopic organisms and plants die, fall to the bottom of the ocean where they are absorbed, and over long periods of time, the remnants of this life, rich in carbon, are carried back into the interior of the Earth and recycled. This pulls carbon out of the atmosphere, which makes sure we don’t suffer a runaway greenhouse effect, which is what happened on Venus. Without the action of plate tectonics, there would be no way to recycle this carbon, and the Earth would become an overheated.
10. That's A Lot of Snow!
Each winter, the Earth is coated in 1 Septillion crystals of snow. That would be a trillion, trillon snowflakes. Someone get the shovel!
Today we discussed about earth and we learn about earth 🌎 let you guys share and follow you
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