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The galaxy is an infinite and vast expanse of space that holds countless secrets. For thousands of years, humans have discovered and witnessed countless amazing astronomical phenomena occurring on this Earth. Among them, there are extremely rare phenomena that perhaps in a person’s life can only be encountered once.
1. Comet Halley
Considered the most common comet known in the Solar System, Halley’s comet is named after astronomer Edmond Halley, who calculated that the star would pass by Earth every 75-76 five.
The last appearance of Halley’s comet was in 1986, and the next one is predicted to be in 2061. Space, “when Halley passes the Earth in 2061, the comet will be on the same side of the Earth and will be much brighter in color than it was in 1986.”
2. Comet Hale-Bopp
Dubbed the Great Comet appearing in 1997, comet Alan Hale was discovered by Thomas Bopp and his laboratory in 1995. It is known that this is one of the most viewed comets in history when shines in the sky for 18 months and is visible to the naked eye from Earth.
In fact, NASA maintains an online database of more than 5000 images of the phenomenon. According to NASA, Comet Hale-Boop is believed to be 1000 times brighter than Comet Halley at the time of its discovery.
Calculating the comet’s orbit, astronomers say it last passed by Earth 4,200 years ago, and predicts the next return is in at least another 4,385 years.
3. Blue Moon
As you probably already know, this phenomenon has nothing to do with the moon magically turning blue. Instead, the name refers to the third full moon in a season with four full moons. According to this calculation, the full moons are about 29.5 days apart, so months of 30 or 31 days can have two full moons.
According to NASA, there is a blue moon every 2.5 years. The last time, the blue moon appeared was in August 2021. So the next blue moon is likely to fall in 2023.
4. Total solar eclipse
The concept of “total eclipse” is probably not too strange to us. This is not a rare phenomenon at the global level, but this phenomenon occurs every 18 months in a specific location only. And for this phenomenon to return to one location can take centuries.
With this, Belgian meteorologist and astrologer Cassini calculated that a total solar eclipse, at any given time on Earth, can only happen again once every 375 years.
5. Storm on Saturn
The Great White Spot, also known as the Great White Oval, are periodic storms so large that they can be seen from Earth through a telescope because of their characteristic white appearance.
Usually these storms will appear with a cycle of 20-30 years and often have an area of hundreds or thousands of kilometers. So far, only six storms have been observed by astronomers in Saturn’s atmosphere since 1876. The last time this happened was in 2010.
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