Almost everything that is known today by scientists, was not known 400 years ago, because it had not been discovered yet. Science was barely getting started, in 1613.
Scientists research more about what people want to know or don't know yet.
scientists use spacecraft without people to explore space because scientists need to know more about space and the solar system
They don't.
Black holes
Many scientists in more than 100 years. See the link below.
the crust because that is the layer we live on so scientists can study it more thourouly
Don't know but I suggest you use proper English and spelling of words. The question is "...many more years YOU'RE going to live". Much and your are just plain wrong grammar and spelling. The wrong word spelled right is still the wrong word.
Galileo and many more
scientists may beleive that dinasours put them there but they dont know for sure the stones werer put there around 500 years ago. google it for more info...
Scientists still do not know why we yawn.Jillian yawned because it was almost midnight.Some people yawn before exercising to get more oxygen into their system.
because they want to know more facts
because they wanted to know more.