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life as we know it

Chart showing that results from a family of simulations that track changing pressures of three gases
Posted inEditors' Highlights

Is Atmospheric Oxygen a Planetary Signature for Life?

by B. Ehlmann 21 April 202115 March 2022

While some Earth-like worlds can generate significant O2 only by biology, “waterworlds” and “desert worlds” can build up O2 even without life because of chemical changes from atmosphere loss to space.

Una representación artística de Europa Clipper volando a través de las plumas de Europa, estudiando la luna y buscando vida.
Posted inNews

Esta búsqueda por vida alienígena comienza con la destrucción de bacterias en la Tierra

by JoAnna Wendel 14 April 202129 September 2021

Algún día, un catálogo de fragmentos moleculares podría ayudar a científicos a identificar vida extraterrestre en las lunas heladas de nuestro sistema solar.

Image of a volcanic lake at Ijen volcano in Indonesia
Posted inNews

Ancient, Acidic Lakes May Have Harbored Life

by R. Kemeny 30 March 202125 March 2022

A new analysis of South African sediments hints that acidic lakes may have leached minerals necessary for biotic life.

A coastal cliff in Newfoundland with visibly stratified rock
Posted inNews

Geologists Have a New Tool for Reconstructing the Ancient Climate

by Clara Chaisson 15 March 20214 October 2021

A new study of seafloor sediments finds that the temperature record in the early Paleozoic corresponds to significant shifts in the diversity of life on Earth.

An illustration showing a protoplanetary disk surrounding a young Sun-like star
Posted inNews

Half of Earth’s Nitrogen May Be Homegrown

by L. Supriya 3 March 202115 February 2022

A new analysis of iron meteorites reveals a distinct isotopic signature that suggests nitrogen was present around early Earth.

An artistic depiction of Europa Clipper flying through the plumes of Europa, studying the moon and searching for life.
Posted inNews

This Search for Alien Life Starts with Destroying Bacteria on Earth

by JoAnna Wendel 8 February 202128 October 2021

Someday, a catalog of molecular fragments might help scientists identify extraterrestrial life on our solar system’s icy moons.

Satellite image of vegetation in Earth’s Eastern Hemisphere
Posted inNews

Chance the Hacker: How Earth Stayed Habitable

by J. Romero 3 February 202129 September 2021

New analysis indicates that planetary feedbacks alone don’t make habitability an inevitability.

Illustration showing the Heliosphere and its surroundings
Posted inEditors' Highlights

The Cosmic Timeline of Heliophysics

by W. K. Peterson 23 December 202029 September 2021

Thom Moore began his career after the start of the space age. This is the story of how he converted his interests in evolution, philosophy, and psychology and writing into the study of heliophysics.

Closeup of an illustration of a trilobite (left) beside blue swirls representing Earth’s magnetic field
Posted inScience Updates

Habitability and the Evolution of Life Under Our Magnetic Shield

by M. Lingam 21 December 20203 November 2021

Earth’s global magnetic field likely dates back billions of years and is a barrier against cosmic radiation. What roles has it played in the planet’s biosphere?

Artist’s conception of WATSON instrument surrounded by life-related molecules
Posted inNews

An Ice Probe on Earth Could Help Us Find Life in Space

by JoAnna Wendel 10 December 202031 March 2022

An instrument called WATSON can help find biosignatures on icy ocean worlds.

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