Related topics: earth · carbon dioxide · ocean · nasa · planets

US watching Chinese rocket's erratic re-entry: Pentagon

The Pentagon said Wednesday it is following the trajectory of a Chinese rocket expected to make an uncontrolled entry into the atmosphere this weekend, with the risk of crashing down in an inhabited area.

Methane nibbling bacteria are more active during summer

Bacteria that thrive on methane released from the ocean floor are an important barrier preventing the greenhouse gas from reaching the atmosphere. A new study finds that these microbial communities flourish in seabed depressions ...

Parker discovers natural radio emission in Venus' atmosphere

During a brief swing by Venus, NASA's Parker Solar Probe detected a natural radio signal that revealed the spacecraft had flown through the planet's upper atmosphere. This was the first direct measurement of the Venusian ...

New model can predict carbon cycle presence on exoplanets

Life thrives at stable temperatures. On Earth, this is facilitated by the carbon cycle. Scientists at SRON, VU and RUG have now developed a model that predicts whether there is a carbon cycle present on exoplanets, provided ...

The Arctic's greening, but it won't save us

There was a hope that as more plants start to grow in Arctic and boreal latitudes as our warming climate makes those regions more hospitable for plants, those photosynthesizing plants would work to help sequester the atmospheric ...

Climate change-resilient infrastructure

When President Joe Biden addresses a joint session of Congress tonight a common thread will likely run through much of his narrative: resilience. Beyond touting his administration's accomplishments, Biden is expected to use ...

page 1 from 40

Atmosphere

An atmosphere (from Greek ατμός - atmos, 'vapor' + σφαίρα - sphaira, 'sphere') is a layer of gases that may surround a material body of sufficient mass, by the gravity of the body, and are retained for a longer duration if gravity is high and the atmosphere's temperature is low. Some planets consist mainly of various gases, but only their outer layer is their atmosphere (see gas giants).

The term stellar atmosphere describes the outer region of a star, and typically includes the portion starting from the opaque photosphere outwards. Relatively low-temperature stars may form compound molecules in their outer atmosphere. Earth's atmosphere, which contains oxygen used by most organisms for respiration and carbon dioxide used by plants, algae and cyanobacteria for photosynthesis, also protects living organisms from genetic damage by solar ultraviolet radiation. Its current composition is the product of billions of years of biochemical modification of the paleoatmosphere by living organisms.

This text uses material from Wikipedia, licensed under CC BY-SA