The universe is so big, but man's range is so small that the furthest man has been so far is the moon, which is only 380,000 km away from earth on average. Of course, humans have also launched all kinds of probes, and if you include them, the range of human activities is much larger.
Category:
Extraterrestrial
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Although we do not know much about these two "super Earths" yet, but from the basic situation, these two "super Earths" are not suitable for human habitation
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Extraterrestrial
What Is So Special About Gliese 581g, Thought To Be The Most Earth-Like Exoplanet Known?
It has been billions of years since life appeared on earth, and although there are seven planets in our solar system in addition to earth, as well as a number of dwarf planets, moons and other relatively large bodies, so far we have not found alien life on any other planet in our solar system for the time being. Even mars, another earth-like planet in the habitable zone of our solar system, has not found a single sign of life. Could it be that life on earth is really unique and no other planet is allowed to have life?
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Extraterrestrial
What Exactly Does The Sun Use As Fuel And How Has It Been Able To Burn For 4.6 Billion Years Without Going Out?
The sun, which we call the 'source of all things', has been sending light and heat to the earth for the past 4.6 billion years, which is why the earth is such a vibrant planet.What exactly does the sun use as fuel and how has it been able to burn for 4.6 billion years without going out?
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Extraterrestrial
How Scary Is It That Pluto's Atmosphere Is Disappearing? It's Not Wrong To Be Kicked Off The Planet List
There are many rumors that Pluto is a terrible world, where the temperature is so low that no life can survive, and even if there is life, it may be some extreme virus, so how terrible and unusual is Pluto?
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Extraterrestrial
A Probe That Flew 22.8 Billion Kilometres And Finally Sent Back Pictures That Teach Mankind a Vivid Lesson
Although the Earth is just a "grain of dust suspended in the sun" in the universe, for us humans, this "grain of dust" is irreplaceable.
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Because Mercury does not have an atmosphere to play a role in insulation, so the temperature of the back side of Mercury can be as low as minus 172 degrees Celsius, and because of the proximity of the sun, the temperature of the sunny side of Mercury will soar to 432 degrees Celsius under the baking of the sun, so it can be seen that Mercury is simply a realistic version of the "world of ice and fire"
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Extraterrestrial
Another Potentially Habitable Planet Has Been Discovered, And The Only Thing Scientists Are Worried About Is The Possibility Of Alien Life
This exoplanet, known as TOI 700d, is about 101.5 light years away from our Earth, which means that even if we were to travel to this exoplanet in a light-speed spacecraft, it would take at least 101.5 years of flight to reach it, so it is very far away
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Extraterrestrial
Having Flown 23 Billion Kilometers, This Photo Of Voyager 1 Is Thought-Provoking: Is Earth a "Zoo"?
At the time of the "family photo" of the solar system, the Voyager 1 probe has reached a distance of 6.4 billion kilometers from Earth, very distant, so in the view of the Voyager 1 probe, the solar system, the major celestial bodies are very small
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Recently, a new study suggests that the darkening of Sensual IV may not have been simply a dust cloud, as it is suspected to have been pierced by a mysterious force before the darkening of Sensual IV