Cosmic dust raining down from space has been discovered on rooftops in three major cities.
The tiny particles date back to the birth of the solar system 4.6 billion years ago.
Scientists usually collect cosmic dust in the frozen wastes of Antarctica. Now, for the first time, the space debris has been found hidden in city dirt.
New observations from a NASA spacecraft could help solve a persistent mystery — why the sun’s atmosphere is so much hotter than its surface.
While the sun’s visible surface is about 10,000 degrees Fahrenheit (5,538 degrees Celsius), its upper atmosphere, known as the corona, has temperatures in the millions of degrees.
Nitrogen is one of the essential nutrients of life on Earth, with some organisms, such as the kinds of microbes found within the roots of legume plants, capable of converting nitrogen gas into molecules that other species can use.
With organisms playing such a crucial role in the chemistry of nitrogen on Earth, scientists are examining nitrogen in billion-year-old rocks to decipher its potential as a bio-signature of life on other planets