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14:34 How did life begin? Are we alone in the universe? How will it all end? In his new book, Cosmic Queries: StarTalk’s Guide to Who We Are, How We Got Here, and Where We’re Going, world-renowned astrophysicist Neil deGrasse Tyson breaks down challenging philosophical conundrums with wit, wisdom, and cutting-edge science. Neil deGrasse Tyson is an astrophysicist and the Frederick P. Rose Director of the Hayden Planetarium at New York’s American Museum of Natural History. He is the author of more than a dozen books many of them international bestsellers and numerous articles, both scholarly and for the general public. ....
Science Advances, the researchers discussed how rocky planets might have formed from small water-bearing dust particles that could give rise to the formation of oceans and continents. How water emerges on planets Scientists are still trying to figure out how water emerged on Earth. One of the prominent theories points to water-bearing comets or icy asteroids that slammed the planet in its infancy. But the researchers are calling that theory into question, positing that water has been present since a planet’s birth. This is true not only for Earth but also for Venus, Mars and many other rocky planets in the galaxy. ....
19 FEBRUARY 2021 A global period of upheaval 42,000 years ago was the result of a reversal in Earth s magnetic field, new research has found. According to radiocarbon preserved in ancient tree rings, several centuries worth of climate breakdown, mass extinctions, and even changes in human behaviour can be directly linked to the last time Earth s magnetic field changed its polarity.
The research team has named the period the Adams Transitional Geomagnetic Event, or Adams Event, after sci-fi writer Douglas Adams, who famously declared the number 42 the ultimate answer to life, the Universe, and everything. For the first time ever, we have been able to precisely date the timing and environmental impacts of the last magnetic pole switch, said Earth scientist Chris Turney of the University of New South Wales in Australia. ....