When did freshwater appear on Earth?
Geologists found chemical ratios in ancient minerals that suggested Earth had freshwater 550 million years after it formed.
Category: What happened in Earth’s past?
What was the Earth like a long time ago? What have archaeologists found? What was it like before life started? How did life come to be?
A new treasure trove of Cambrian fossils
Paleontologists discovered a new set of fossils from the ancient ancestors of animals in rocks from China.
Is Earth safe from nearby exploding stars?
Scientists used an Earth system model to test how radiation from a nearby supernova would affect life on our planet. They found that the…
Volcanism warmed past Earth
Geologists dated a global warming event about 180 million years ago. They found it lasted between 169,000 and 417,000 years and was linked…
How complex plants reshaped the oceans
Researchers found that when complex plants evolved, they increased ocean oxygen and massively restructured the marine ecosystem.
Bat poop corrodes cave formations
Scientists found that bat droppings, microorganisms, and dripping water combine to dissolve cave formations in Slovakia and Poland.
Lightning reacts with minerals to create the building blocks of life
Scientists stimulated atmospheric gases with electricity and found they reacted with common salts and minerals to form complex chemicals…
When did the Galápagos tortoises become giant?
Researchers analyzed new fossils from Ecuador that suggested the ancestors of Galápagos giant tortoises inhabited northern South America…
How complex life arose under extreme stress
Scientists discovered molecules that helped the first complex life forms build strong cell membranes to withstand extreme environments.
Remains of the Moon could be lurking inside Earth
Scientists used models to test whether remnants of the moon-forming impactor, Theia, are present deep within the Earth.