10 Interesting Facts About Earth

NASA Captures Dark Side of the Moon

Our beloved planet Earth has all the makings for a jaw-dropping movie: from the drama of fiery volcanoes and catastrophic collisions between rocky plates to the seeming fantasy of the ocean’s deep abysses swirling with various life and tales of the coldest, hottest, deepest, highest and all-out extreme spots.

Did you know Earth is not actually a sphere? That we are flying around the sun at 67,000 mph? That the bulk of Earth’s freshwater is locked up in Antarctica?

We dug through archives to assemble just 10 of the most amazing and fascinating facts about Earth.


We’re the third rock from the sun


Solar System Montage

(Image credit: NASA)

Our home, Earth, is the third planet from the sun and the only world known to support an atmosphere with oxygen, oceans of liquid water on the surface and — the big one — life. Earth is one of the four terrestrial planets: Like Mercury, Venus, and Mars, it is rocky at the surface.


Earth is a squashed sphere


Earth in a water droplet

(Image credit: Markus Reugels, LiquidArt)

Earth is not a sphere. As Earth spins, gravity points toward the center of our planet, and a centrifugal force pushes outward. But since this gravity-opposing force acts perpendicular to the axis of Earth, and Earth’s axis is tilted, centrifugal force at the equator is not exactly opposed to gravity. This imbalance adds up at the equator, where gravity pushes extra masses of water and earth into a bulge, or “spare tire” around our planet.


The planet has a waistline


Measuring tape wrapped around the Earth (photo of Earth from NASA)

(Image credit: Jessmine | Shutterstock)

Mother Earth has a generous waistline: At the equator, the circumference of the globe is 24,901 miles (40,075 kilometers). Bonus fact: At the equator, you would weigh less than if standing at one of the poles.


Earth is on the move


A true-color image taken on May 5, 2000, by an instrument aboard NASA's Terra spacecraft, over the North Pole, with sea ice shown in white and open water in black.

(Image credit: Image by Allen Lunsford, NASA GSFC Direct Readout Laboratory; Data courtesy Tromso receiving station, Svalbard, Norway)

You may feel like you’re standing still, but you’re actually going — fast. Depending on where you are on the globe, you could be spinning through space at just over 1,000 miles per hour. People on the equator move the fastest, while someone standing on the North or South pole would be perfectly still. (Imagine a basketball spinning on your finger. A random point on the ball’s equator has farther to go in a single spin as a point near your finger. Thus, the point on the equator is moving faster.)


The planet moves around the sun

Spring is off to a warm start.

(Image credit: © Tatiana Morozova | Dreamstime.com)

Oh yeah, and the Earth isn’t just spinning: It’s also moving around the sun at 67,000 miles (107,826 km) per hour.


Earth is old

(Image credit: Science/AAAS)

Researchers calculate the age of the Earth by dating both the oldest rocks on the planet and meteorites that have been discovered on Earth (meteorites and Earth formed at the same time when the solar system was forming). Their findings? Earth is about 4.54 billion years old.

(Photo shown here, what may be the oldest known rocks on Earth, called the Nuvvuagittuq Belt on the coast of the Hudson Bay in Northern Quebec, and dating back to 4.28 billion years ago, scientists estimate.)


The planet is recycled

The first view of Earth from NASA's VIIRS satellite.

(Image credit: NASA’s NPP Land Product Evaluation and Testing Element.)

The ground you’re walking on is recycled. Earth’s rock cycle transforms igneous rocks into sedimentary rocks to metamorphic rocks and back again.

The cycle isn’t a perfect circle, but the basics work like this: Magma from deep in the Earth emerges and hardens into rock (that’s the igneous part). Tectonic processes uplift that rock to the surface, where erosion shaves bits off. These tiny fragments get deposited and buried, and the pressure from above compacts them into sedimentary rocks such as sandstone. If sedimentary rocks get buried even deeper, they “cook” into metamorphic rocks under lots of pressure and heat.

Along the way, of course, sedimentary rocks can be re-eroded or metamorphic rocks re-uplifted. But if metamorphic rocks get caught in a subduction zone where one piece of crust is pushing under another, they may find themselves transformed back into magma.


Our moon quakes

seismometer on moon to monitor for moonquakes

(Image credit: NASA)

Earth’s moon looks rather dead and inactive. But in fact, moonquakes, or “earthquakes” on the moon, keep things just a bit shook up. Quakes on the moon are less common and less intense than those that shake Earth.

According to USGS scientists, moonquakes seem to be related to tidal stresses associated with the varying distance between the Earth and moon. Moonquakes also tend to occur at great depths, about midway between the lunar surface and its center.


Alaska had the largest earthquake

Alaska Earthquake March 27, 1964. The Four Seasons Apartments in Anchorage was a six-story lift-slab reinforced concrete building which cracked to the ground during the quake. Credit: USGS

(Image credit: USGS)

As of March 2016, the biggest earthquake to shake the United States was a magnitude-9.2 temblor that struck Prince William Sound, Alaska, on Good Friday, March 28, 1964. (Photos shows the Four Seasons Apartments in Anchorage, a six-story lift-slab reinforced concrete building, which cracked to the ground during the quake.) And the world’s largest earthquake was a magnitude 9.5 in Chile on May 22, 1960, according to the U.S. Geological Survey (USGS).

Next up: The hottest place on Earth.


The hottest spot is in Libya

a nasa image showing earth's hottest surface temperatures

(Image credit: NASA image created by Jesse Allen, Earth Observatory)

The fiery award for Earth’s hottest spot goes to El Azizia, Libya, where temperature records from weather stations reveal it hit 136 degrees Fahrenheit (57.8 degrees Celsius) on Sept. 13, 1922, according to NASA Earth Observatory. There have likely been hotter locations beyond the network of weather stations. (The image was created from data collected by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite.)


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