Pettit takes his photos from the cupola on the space station, a favorite of crew members due to its seven windows that overlook Earth. Here are some of his most unforgettable views of what it’s ...

The Archean space rock in that impact ... Geological discoveries changed that view dramatically in the late 1980s and 1990s. In the Archean strata of South Africa, for instance, geologists ...

Banded iron formations were deposited in the Archean and Paleoproterozoic eons ... the study is that pale-green dot worlds viewed from space are good candidates planets to harbour early ...

Upper bounds on the atmospheric CO2 concentration in the Late Archean/Paleoproterozoic (2.8–2.2 Ga) from paleosol data suggest that additional greenhouse gases must have been present.

Nearly three-fourths of Earth is covered by oceans, making the planet look like a pale blue dot from space. But Japanese ... formations were deposited in the Archean and Paleoproterozoic eons ...