A solar eclipse is a rare event, and getting more rare all the time.
Orbital debris poses a risk to spacecraft, but it’s a risk we can manage.
New evidence suggests Earth may have been formed from two worlds.
We generally think of the Earth as having a constant mass. On a basic level that’s true, but the Earth’s mass does change very slightly. So is it’s mass increasing or decreasing? The short answer is we don’t know.
Most of the worlds of the inner solar system are fairly dry. So how did Earth come to have large oceans on its surface?
The Earth has a spherical shape (technically an oblate spheriod) but it’s gravitational field is not as spherical.
You may have heard about a “Star Trek-like” shield that scientists have found surrounding the Earth. That’s because the University of Colorado Boulder shamefully stated as much in a press release, and websites all over the world would rather copy and paste than actually do science journalism. The press release was promoting a new paper in Nature which looks at properties of the Earth’s radiation belts.
Earth’s water is more ancient than you might suspect.
Imagine if a Tunguska event occurred every 5 years or so. Every few years, and some part of the planet gets a crater, or an airburst. Most would be in remote areas, but some wouldn’t. Of course we know that meteors follow a power law distribution in size distribution. So for every Tunguska event, there would be thousands of Chelyabinsks. So perhaps 200 of them every year. Then there are the larger ones. Big impacts creating 10km-wide craters every century or so. And the ever larger ones every millennia. Now imagine Earth gets pummeled at this rate for 200 million years.
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