Some scientists are searching not just for any life out there in the universe, but for our distant relatives. Earth may have seeded life on other planets if an asteroid smacking into Earth sprayed DNA into space, researchers suggest. Now a team of researchers is searching for siblings of the sun — stars born from…
Pumice-like cratery indents formed by ancient raindrop splats are adding to the mystery of why the adolescent Earth was warm enough to host rivers and oceans, despite the dim sun of the day. Thanks to fossilized impressions from rains that fell down on Africa 2.7 billion years ago, the “Faint Young Sun” paradox is getting…
The Great Rift Valley of East Africa – the birthplace of the human species – may have taken much longer to develop than previously believed. Scientists now believe the western portion of the rift is approximately as old as the eastern part – about 25 million years old. Previous studies have repeatedly suggested the Eastern…
The moon, that giant lump of rock that has fascinated poets and scientists alike, may be about to get even more interesting. A new analysis of isotopes found in lunar minerals challenges the prevailing view of how Earth’s nearest neighbor formed. Most scientists believe Earth collided with a hypothetical, Mars-sized planet called Theia early in…
Scientists want to know if planets can form near the supermassive black hole at the core of the galaxy. If so, the black hole could fling them out into space at enormous speeds that, from our vantage point, could appear to approach the speed of light. One way to answer the question, at least as…
A layer of partially molten rock about 22 to 75 miles underground can’t be the only mechanism that allows continents to gradually shift their position over millions of years, according to a NASA-sponsored researcher. The result gives insight into what allows plate tectonics – the movement of the Earth’s crustal plates – to occur. Our…
The early Earth flipped back and forth between a hydrocarbon-free atmosphere and a hydrocarbon-rich one similar to that of Saturn’s moon, Titan. This ‘see-sawing’ atmosphere over 2.5 billion years ago was the result of intense microbial activity, say Newcastle University scientists, and would have had a profound effect on the climate of the Earth system….
Given the same raw materials, Mars would have been a better host for life to arise than Earth, which some scientists believe was too flooded for the chemistry of life to gain a toehold. Without at least occasional dry land, the chemistry needed to get life started doesn’t work very well because the molecules to…
In celebration of 1,000 days in orbit, the Lunar Reconnaissance Orbiter team released two beautiful videos of our moon, one a fiery drama showing the moon’s tough evolution and another touring its most interesting sites. The historical montage takes you from the moon’s earliest days, through the massive south pole splat that formed the South…
New evidence supports the idea that a huge space rock collided with our planet about 13,000 years ago and broke up in Earth’s atmosphere, a new study suggests. This impact would have been powerful enough to melt the ground, and could have killed off many large mammals and humans. It may even have set off…