Like many important theories in science, plate tectonics, the concept that the Earth’s surface is like a cracked eggshell with each piece floating on a convective mantle of molten rock, was once considered a crackpot idea. But sometimes crackpot ideas are right. Plate tectonics now underpins all of geology, much like the Big Bang Theory is the foundation of astronomy and astrophysics.
The theory of plate tectonics was deduced in the mid-20th century by a handful of scientists and cartographers who wondered why, for example, the eastern coast of South America complemented so precisely the shape of the western coast of Africa, and why fossils of long-extinct animals were found scattered on different continents separated by wide oceans, and why volcanoes and earthquakes are far more common in some locations than others, and why fossilized marine creatures are sometimes found at the tops of mountains. Before plate tectonics, these observations were a mystery. After plate tectonics, they all started to make sense. [Read more…] about Find Your Address on Earth, 700 Million Years Ago
Share This:
Many casual observers get hooked on amateur astronomy after a first look at Saturn through a telescope. More than a few have looked through my small refractor on a night of good seeing and asked of Saturn, “Is it real?” Yes, it is real. And it’s one of the most beautiful things you will ever see. The color of Saturn, the proportions, the apparent 3D perspective of this grand icy world make it arguably the finest sight accessible with a small telescope. The planet reaches opposition on June 27, 2018 and will remain bright and large in a telescope over the next few months. Here’s how to find it and see it in a small telescope.
