Astronomical science is the knowledge that many astronomical lovers want to understand, but we don't know about some small knowledge. Here's what i hope to do for you。
Star
Stars are the most basic objects in the universe. They are self-luminescence and consist of incandescent gases, the main components of which are hydrogen and helium。
Sun
The sun is a spherical object made up of hot gases with hydrogen and helium as the main ingredients. The size of the sun is about 1. 3 million times the size of the earth. The atmospheric structure of the sun is the external structure of the sun, which is divided from the inside into the pv layer, the colour layer and the corona layer. The solar activity cycle is 11 years, with the main signs being black and flares. The effects of solar activity on earth: (1) the ionosphere that disrupts the earth's atmosphere; (2) the phenomenon of “magnetic storms”; and (3) the generation of aurora。
Planet
Planets are near-spherical objects orbiting the sun in elliptical orbits that do not glow and are much smaller in mass than the sun. The eight planetary ranges currently known in the solar system are near and in descending order: mercury, venus, earth, mars, jupiter, saturn, uranus and neptune。
Sun-eat
When the sun, the moon and the earth operate around a line, the moon shadows over the earth, causing daily food. How much of the sun is covered by the moon can be divided into eclipses, whole-day meals and eclipses。
[lunar eclipse]
When the sun, the earth, the moon runs the line of the moon, the moon runs into the shadow of the earth, and it forms the eclipse. The amount of sunlight that covers the earth's surface can be divided into monthly appetites and total monthly diets。
What is the universe?
A: the universe is the sum of all that is in the heavens and all that is in the earth. It is neither marginal nor end, nor begins and ends。
How big is the galaxy?
A: there are many stars that come together to form a giant galaxy, the galaxy in which the solar system is called the milky way. The milky way system is like a giant iron cake, about 80,000 light-years wide, with a centre of about 12,000 light-years thick and a total of more than 1,000 stars。
Why don't you see the stars during the day?
A: because part of the sunlight is dispersed by gas and dust in the atmosphere during the day, the sky is very bright, and the light of solar radiation is so strong that we cannot see the stars coming。
What bodies in the solar system?
9 planets in the solar system. They are, in turn, mercury, venus, earth, mars, jupiter, saturn, uranus, neptune and pluto. In addition, there are many asteroids, comets and meteorites in the solar system, with 2958 officially numbered asteroids. The biggest comet is harley。
Why do stars have different colors?
A: the color of the star is determined by its temperature. Different colours represent different surface temperatures: blue-haired stars have high surface temperatures and red ones have low surface temperatures。
What's the brightest star?
The brightest star in the sky is sirius, which is 1. 46 and so on. 8. 7 light years from earth。
How do we find the north star?
A: it's easy to find the north star in the sky: first big bear, then the big bear seven. A straight line is drawn from the two finger stars on the head of the spoon, which extends through the north star. The distance between the north star and the spoon is exactly five times the distance between two fingers. You can also look for the north star through queens。
How high is the sky?
The blue sky is actually the atmosphere of the earth. The atmosphere is the air surrounding the earth, divided into five layers, depending on air density, amounting to 2,000 to 3,000 kilometres thick. However, most of the air is concentrated from the ground to below 15 kilometres, and the more thinner the air reaches. The atmosphere should be as thick as the sky。
Why is the sky blue?
A: when the sun's light reaches the earth's atmosphere, the blue light is most easily separated from the other colours and spreads into the air to reflect it. And the other colours have a strong ability to penetrate the earth through the atmosphere, so we see only blue light in the sun。
Why is the sky red at sunset?
A: because the sun comes at sunset and the sun goes especially far in the atmosphere. With the exception of red light, the light of several other colors can't spread that far, and it's gone before our eyes. Only the red light runs as far as we can see in our eyes, so we see the color of the sky at sunset。
Does the moon shine?
A: the moon is not a star, it cannot shine, but it reflects the sun. Although only seven percent of the light it reflects reaches earth, it is enough to light up the night on our planet。
How many stars can we see?
A: we can see 7,000 stars from earth with our naked eyes, but because the earth is round, and wherever we are on earth, we can only see half the sky, and the stars close to the horizon are not clear, so we can actually see only about 3,000 stars with our naked eyes。
How hot is the sun?
The central temperature of the sun is as high as 192,000,000°c and the surface temperature is 6,000°c. But because the sun is very far from us, 150 million kilometres, we don't feel so hot。
Why is the earth spinning?
A: because of its gravity, the earth turns around. The earth rotates at a rate of 1,700 kilometres per hour, or 470 metres per second; the rate of public rotation is about 29. 8 kilometres per second。
Why is the noon sun white?
A: because, at noon, the sun can be projected directly on the ground, unlike what will sooner or later be blocked by what is on the ground (e. G. Mountains, trees, buildings, and muddled air), it remains the original white light that inspires people not to open their eyes。
What's the small knowledge of astronomical science
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