As with any science, astronomers must be knowledgeable of the equipment they are using.
In the past, Earth has been bombarded by large meteorites, some having caused world-wide impact to the ecosystem.
Two of the most spectacular events in astronomy are solar and lunar eclipses.
Northern Arizona astronomy
The internet is a great way to get facts on just about any subject.
When Galileo Galilei began studying the evening sky with his telescopes, astronomy took a huge leap forward.
Earth's climate has changed. During the last 650,000 years there have been seven ice ages. The last one ended around seven centuries ago, marking the modern climate era in which human civilization advanced.
While I was growing up in the 1960’s, astronomy seemed to have most of the basic answers, especially concerning our solar system.
In high school science class, you were told that there were three fundamental atomic particles. As far as what most people need to know, these electrons, protons and neutrons are probably as far as most people study in chemistry.
Except for Star Trek, Star-gate and a host of other Sci-Fi TV shows, books and movies, life in the universe has yet to be discovered, let alone intelligent forms, except on Earth, and some would be skeptical there.