Answer:
some comet are very difficult to see because they are made of water and dust and they reflect light very well, so scientists only know about those that make regular appearances, and some comets have not been discovered yet and due to that scientist both sky watchers and strong telescope to report new comets and only them can identify them, although some comet can be seen easily by ordinary people
Explanation:
Although some comet are difficult to see, scientist uses sky watchers to help them to spot them, they also use strong telescope to identify them
1.C
2.B
3.D
4.A
cant answer the fifth since we cant see the underlined phrase
well it says here in the exerpt that they bursted out in to laughter showing they thought that was a joke.
Credent definition: believing or believable.
