It wasn't always this way. Like most planets Earth's earliest atmosphere was dominated by hydrogen and helium. These two elements are by far the most abundant in the Universe.About 92% of the ...

The Earth's atmosphere also traps heat from the Sun, in what is known as the greenhouse effect, and without this phenomenon, the Earth would be a much colder place, making it much more hostile to ...

Operating at 2.5 GHz to pass through Earth’s clouds and atmosphere, 20 TW from lunar-based electric power requires only 40,000 square miles (100,000 km2) of rectenna area on Earth.

Today, some 20 percent of Earth's atmosphere is free molecular oxygen, or O 2. Free oxygen is not bound to another element, as are the oxygen atoms in other atmospheric gases like carbon dioxide ...

Element No. 8 on the Periodic Table of the Elements is a colorless gas that makes up 21 percent of Earth's atmosphere. Because it's all around, oxygen is easy to dismiss as dull and inert; in fact ...

Som and David Catling, a professor of earth and space sciences at the University of Washington, are proposing a radically different idea: that 2.7 billion years ago, Earth had a thin atmosphere ...

From heaven to hell. This is where the how-close-you-are-to-the-sun part comes in. On Earth, all that water vapor belched out of volcanoes condensed in the young atmosphere into liquid water, then ...

Satellites in low-Earth orbit are doomed to burn up as they reenter Earth's atmsopehre. (Image credit: PaulFleet via Getty Images) The sky is littered with metal pollution from bits of space junk ...

Astronomers have spotted an unexpected chemical element high within the atmosphere of two sizzling exoplanets where liquid iron and gems rain down ... WASP-121b is about 855 light-years from Earth.