A shower of matter from space millions of years ago could have led to drastic changes in the Earth’s climate, followed by the extinction of life on a massive scale, which also killed off the dinosaurs. This at least is a theory put forward by scientists from the University of Bonn. Normally, the solar wind acts as a shield against showers of cosmic particles, which prevents too many energy-rich particles from raining down on our atmosphere. Since 1997 scientists from Bonn, funded by the German Research Council (Deutsche Forschungsgemeinschaft or DFG), have been examining how and why this gigantic shield works.
They were the undisputed masters of a whole geological era until they suddenly disappeared 65 million years ago. ‘Perhaps Earth just became too damp and too cold for dinosaurs at that time,’ Professor Hans Jörg Fahr from the Bonn Institute of Astrophysics and Extraterrestrial Research surmises. The reason for the sudden change in climate could have been excessive pressure on our cosmic umbrella.
The solar system does not stand still, in fact it orbits the centre of the Milky Way once every 250 million years. In the process it also passes through dense clouds of interstellar matter, which causes problems for the solar wind and thus for the Earth. Whereas the solar wind normally protects the Earth from a hail of interstellar particles like a huge bullet-proof vest, there are then suddenly up to a hundred times more particles raining down into the earth’s atmosphere at enormous speeds. On impact they smash the air molecules into electrically charged fragments. These function as condensation nuclei on which droplets of water form. “The result is dense cloud cover with greater precipitation and sinking temperatures,” says Professor Fahr, who bases his remarks on research worldwide.
Professor Hans Jörg Fahr | alphagalileo
The unintended consequences of dams and reservoirs
14.11.2018 | Uppsala University
Earth's magnetic field measured using artificial stars at 90 kilometers altitude
14.11.2018 | Johannes Gutenberg-Universität Mainz
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.
When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure
Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...
Physicists at ETH Zurich demonstrate how errors that occur during the manipulation of quantum system can be monitored and corrected on the fly
The field of quantum computation has seen tremendous progress in recent years. Bit by bit, quantum devices start to challenge conventional computers, at least...
09.11.2018 | Event News
06.11.2018 | Event News
23.10.2018 | Event News
14.11.2018 | Materials Sciences
14.11.2018 | Health and Medicine
14.11.2018 | Life Sciences