be'coz my favorite lesson is science and that's my interest..
2007-05-05 14:48:12 · 5 answers · asked by Hannakhei 1 in Science & Mathematics ➔ Astronomy & Space
Astronomy doesn't know anything - it has no mind or brain to know anything with. But people (astronomers) can think and learn.
Astronomers have decided (though not unanimously) that at this time there are 8 planets in our system (there used to be 9 but the demoted Pluto to dwarf planet and promoted Ceres and Eris to dwarf planets at the same time). With time and improved instruments, they will likely detect more objects past the orbit of Neptune (in what is called the Kuiper Belt - where Pluto and its moons and Eris are the 2 currently known examples).
Outside our solar system, astronomers have detected evidence of over 200 planets orbiting over 160 other stars.
And if your favourite lesson is science you should also consider taking some language courses - you're going to need to be able to spell and communicate intelligently if you want to have a career in science (or anything else).
2007-05-05 15:21:31 · answer #1 · answered by Anonymous · 2⤊ 0⤋
Science includes grammar.
Science that cannot be communicated is not knowledge; it is noise.
Read literally your question needs this response:
Astronomy is not a person or a group of people; it is a discipline and therefore cannot "know" anything.
There is no real planet called "9".
There is no group of planets called "9".
Every science, that I have heard of, requires many more lessons than the singular "lesson" that you referred to.
My best guess (and it is only a guess) is that you want to know that there are eight known planets and three known dwarf planets.
Science is fun; go for it.
2007-05-05 14:53:13 · answer #2 · answered by J C 5 · 2⤊ 0⤋
There are only 8 planets in the solar system. There are some that we don't know about. But there are millions left throught the universe to find.
2007-05-05 17:06:53 · answer #3 · answered by Mr. Smith 5 · 0⤊ 0⤋
Really, they dont know. Some are now saying that there is only 8, because they say Pluto doesnt really qualify as a planet.
Who knows, tomorrow we could wake up and they could find another and another. There is so much about space that we just dont know. .
2007-05-05 15:00:26 · answer #4 · answered by Anonymous · 0⤊ 0⤋
That is how many we can see. There may be more, but we haven't seen them yet. Any more must be very far away and hard to see because we have really good telescopes today and could see any closer planets if they were there.
2007-05-05 14:56:31 · answer #5 · answered by campbelp2002 7 · 0⤊ 0⤋