1. In ancient times, human beings could only look up at the starry sky with the naked eye, and their understanding of the universe was vague and full of imagination.

2. 1609, Galileo began to observe the nearby planets with a telescope. He found that the target star has four dots, which are its satellites, thus creating a new era of observation.

3. By 178 1 year, the planet's hidden tracks in the dark can already be calculated from the observed data. Later, people observed with astronomical telescopes and found more stars by comparing the stars on the photo board.

4. During the Cold War, the Soviet Union successfully launched an artificial satellite orbiting the earth, which opened the door to deep space exploration. During that time, there were a series of missions to Mercury, Venus, Mars and Jupiter, some of which were very successful. Later, Americans landed on the moon. Russian space station.

In 1990s, the successful launch of Hubble Space Telescope magnified human vision many times, and many countries jointly established a space station. Was discovered by former Hades. A probe landed on Titan before.

Now people are interested in whether there is a planet more suitable for human habitation, finding life on Mars, transforming Mars and establishing a permanent base on the moon. Explore Jupiter's moon Europa.