Earth

Earth is the third planet from the Sun in the Solar System. It is the only planet known to have life on it. The Earth formed about 4.6 billion years ago...

The history of the Earth describes the most important events and stages in the development of the planet Earth from its formation to the present day....

Earth science is an all-embracing term for the sciences related to the planet Earth. Earth science may also be called geoscience. Geoscience is the study...

The Earth phase, or Terra phase, is the shape of the directly sunlit portion of the Earth as viewed from the Moon (or elsewhere extraterrestrially). From...

include near-Earth asteroids (NEAs) and near-Earth comets. They include more than ten thousand near-Earth asteroids (NEAs), near-Earth comets, some solar-orbiting...

Middle-earth is a fictional fantasy world invented by J. R. R. Tolkien. Several of his books take place there, such as The Hobbit and The Lord of the...

The alkaline earth metals are the second group of metals on the periodic table. They are related to the Alkali metals, but they do not react as much because...

Rare earth elements ("REEs") are a set of seventeen chemical elements. They include the fifteen lanthanides plus scandium and yttrium. Scandium and yttrium...

The structure of the Earth is divided into layers. These layers are both physically and chemically different. The Earth has an outer solid layer called...

Snowball Earth or Icehouse Earth refers to times when the Earth's surface was nearly or entirely frozen. The occurrence of Snowball (or Slushball) Earths is...

The age of the Earth is estimated at a little over 4.5 billion years. Working this out was a difficult problem to solve. For most of human history, the...

The Earth's atmosphere is the layer of gasses around the Earth. It is held in place by Earth's gravity. It is today made up mainly of nitrogen (78.1%)...

The Flat Earth Society (or the International Flat Earth Research Society) is an organization claiming that the Earth is flat (most of us think it is round;...

The Earth's core is the part of Earth in the middle of our planet. It has a solid inner core and a liquid outer core. The temperature of the outer core...

earth is a scientifically false hypothesis that the surface of the Earth is not roughly a sphere, but rather flat (a plane). Belief in a flat Earth is...

The Lincoln Near-Earth Asteroid Research (LINEAR) project is a project that is used for the finding and tracking of near-Earth asteroids. The project...

This article is about the fictional from J. R. R. Tolkien's Middle-earth universe. It includes major regions of the world, geographical features such...

Earth Day is a day that is supposed to inspire more awareness and appreciation for the Earth's natural environment. The goal of Earth Day is to support...

Young Earth creationism (YEC) is the belief that the God of Judaism or Christianity created the Universe, the Earth and all life on Earth over a short...

Google Earth is a virtual globe program that was first called Earth Viewer. Keyhole, Inc. created it in 2001. It has been owned by Google since 2004. The...