To the list of planets orbiting distant stars, add another 715. That’s the number of planets, strewn among 305 planetary systems, popping out of the observational data from NASA’s Kepler space telescope.
“We’ve almost doubled today the number of planets known to humanity,” said Jack Lissauer, a NASA planetary scientist, announcing the discovery during a teleconference Wednesday with reporters. The findings will be published in March in two scientific papers in the Astrophysical Journal.
A statue thought to be an ancient bronze of Apollo, Greek God of poetry and love, has dropped off the radar after being found in the sea off Gaza last summer and surfacing briefly on eBay. It is 2,500 years old and priceless.
Our universe is about 13 billion years old, and for roughly 3.5 billion of those years, life has been wriggling all over our planet. But what was going on in the universe before that time? It’s possible that there was a period shortly after the Big Bang when the entire...
The 3D maps and animations are the early results of an unprecedented $300 million international collaboration to document the presence of trace metals and other chemicals in the world’s oceans. The substances, which often occur in minute quantities, can provide important clues to understanding the ocean’s past—such as how seawater masses have moved around over centuries—and its future, such as how climate change might shift key biochemical processes. Over about 30 cruises in the past few years, researchers have collected nearly 30,000 water samples at 787 study sites. Then, using painstaking techniques—including wearing “moon suits” and working in clean rooms to prevent contamination—they’ve measured elements like iron, nickel, and zinc. The effort, known as GEOTRACES, “is a huge improvement over what we were able to do in the past,” says ocean chemist Hein de Baar of the Royal Netherlands Institute for Sea Research in Texel.
A warmer planet can destabilise an important oceanographic process in the North Atlantic called deep water formation. If deep water formation is affected, it will have a profound impact on global climate and precipitation.
In recent years, researchers have prepared ferrofluids, which have the fluid properties of a liquid and the magnetic properties of a solid. The ferrofluids actually contain tiny particles (~10 nm diameter) of a magnetic solid suspended in a liquid medium.
Ferrofluids were originally discovered in the 1960s at the NASA Research Center, where scientists were investigating different possible methods of controlling liquids in space. The benefits of a magnetic fluid were immediately obvious: The location of the fluid could be precisely controlled through the application of a magnetic field, and, by varying the strength of the field, the fluids could be forced to flow. Researchers have prepared ferrofluids containing small particles of ferromagnetic metals, such as cobalt and iron, as well as magnetic compounds, such as manganese zinc ferrite, ZnxMn1-xFe2O4. (0 < x < 1; this is a family of solid solutions). But by far, the most work has been conducted on ferrofluids containing small particles of magnetite, Fe3O4.
Why does a mouse's heart beat about the same number of times in its lifetime as an elephant's, although the mouse lives about a year, while an elephant sees 70 winters come and go? Why do small plants and animals mature faster than large ones? Why has nature chosen such radically different forms as ...
A new study, published in the Journal of Archaeological Science, suggests that the site researchers had previously thought was the starting place of many of Stonehenge's rocks may not have been the source after all. Instead, it looks like the rocks actually come from a different site three kilometres ...