4.5 billion years ago, the solar system formed in a huge cloud of gas
Black holes themselves cannot be directly observed,
But astronomers can observe indirectly through the influence of the huge gravitational force of the black hole on its surroundings.
Black holes have no volume, no extent, but infinite density.
The collapse that occurs when a star several times the mass of the sun dies is one of the ways in which black holes are created
Black holes can warp space-time and even slow the flow of time.
Personal Accelerated Airsickness Medicine
high gravity sailing
high speed jump
spaceship thrusters
gravity
weightless shoes
Quantum transition - because of the absorption of light waves
space travel
Earth - Solar System - Milky Way - Local Group - Virgo Supercluster
Ibn al-Haytham was the first to lay down scientific laws, he discovered the principle of light-shading
Finding the truth is difficult, and the journey is rough and arduous. As a truth seeker, you'd better reserve your judgment and not easily believe the words of your ancestors. You must start from every angle, question and strictly examine the literature. You must Only submit to arguments and experiments, not just rely on someone's statement, because everyone is prone to succumb to various forms of imperfection. As truth seekers, when we investigate, we must simultaneously doubt and question our own ideas. Only in this way can you avoid prejudice or ill-consideration, and when you practice this method, the truth will naturally appear before your eyes.
William Herschel discovered outer infrared, light reflected through a prism to measure temperature
short wavelength of light
Fraunhofer, prism telescope, spectral lines
Wolves evolve into dogs, humans choose, shape
The telescope is essentially a time machine. The earth is 1 light-second from the moon, 8 light-minutes from the sun, and the speed of light is 400,000 kilometers per second.
The Sapir Wolf Hypothesis: He claims that your language produces speaking habits, and these speaking habits turn into thinking habits, so your language makes you habitually think in a certain way, and This can have a huge impact on the way you understand the world. And the question is, how big is the impact?
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