Prepare the paper-cut materials first, then fold the colored paper diagonally into triangles, and finally cut off the shadows with scissors.

A star is a celestial body visible to the naked eye in the universe. The energy activity inside the star makes the shape of the star irregular. Stars can be roughly divided into planets, stars, comets, white dwarfs and so on.

The brightness of a star is usually expressed in magnitude. The brighter the star, the smaller the magnitude. The brightest planet is Venus, the fastest star runs at more than 240 kilometers per hour, and H 1504+65 is the hottest white dwarf.

Comets, like Halley's Comet, the light we see is caused by the tail of a comet whose material is melted when it passes through the solar system, so we often see comets with long tails. Most of the stars you can see at night are stars, and a few are planets in our solar system, such as Venus, Mercury and Mars.

The luminous principle of stars is similar to that of our sun. Most of them release energy in the process of hydrogen condensation into helium nuclei, and some of them release energy through helium fusion.

Just because they are far away from us, they look like gentle little stars. In fact, they are much bigger than the sun. This planet looks bright because it reflects the light from the sun, but it looks brighter than the stars because it is touched by light that is very close to us.