The Universe, according to our best understanding, just doesn’t add up. Wherever we look — from tiny subatomic scales all the way up to planetary, galactic, or even cosmic ones — we find that everything is overwhelmingly made of matter, rather than antimatter. We have a remarkable story of how our Universe came to be the way it is today: the hot Big Bang, as well as an understanding of how the particles that exist in our Universe behave: according to the rules of the Standard Model. But they can’t explain the Universe we know we actually inhabit.
The laws of physics, as we know them, aren’t perfectly symmetric between matter and antimatter, instead displaying subtle but important differences. These differences…
The most famous comet of all — Halley’s comet — returns to our inner Solar System every ~76 years.
Using Newton’s gravitational law, Edmond Halley calculated that this 1682 comet also appeared in 1607 and 1531.
In 1705, he predicted the comet’s 1758 return and every subsequent ~76 years thereafter, periodically.
This prediction was confirmed by Johann Georg Pallich, who observed Halley’s comet on Christmas Day, 1758.
Every 74–79 years, the comet returns: most recently in 1986 and next in 2061.
Like all comets, fragments break off when it approaches the Sun.
Cometary debris spreads out along its orbit, creating meteors upon encountering our atmosphere. …
According to our best understanding of Earth’s climate, the global average temperature has increased significantly over the past ~140 years: the amount of time for which a reliable, direct temperature record exists. …