How many planet in are Solar system ?

Question

How many planet in are Solar system ?

Answer 1

8

Answer 2

Contrary to what you might think, this is a tricky question to answer. In our solar system there are officially 8 planets;

Mercury

Venus

Earth

Mars

Jupiter

Saturn

Uranus

Neptune

There were previously 9 officially recognised planets, with the ninth being "Pluto". However it is no longer considered a planet, as per the IAU's (International Astronomical Union's) decision on the 24th August 2006. This was due mostly to the fact that it has an erratic orbit which crosses that of Neptune. This negates its status of a planet as it does not meet the criteria set out in the IAU's definition of a "planet".

For more information on this, see...

http://news.bbc.co.uk/1/hi/sci/tech/5282...

http://science.howstuffworks.com/pluto-p...

Answer 3

The answer is eight.

Mecury, Venus, Earth, Mars, Jupiter, Saturn, uranus and neptune.

Pluto is no longer 'considered' planet.

Answer 4

Eight.  Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.  

Pluto was considered to be the ninth planet, but it was "demoted" when it was realized that it was much smaller than the others, and that there are many similar-sized objects out there.

Answer 5

many people would say nine and teachers still accept nine as a correct answer... Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto  however pluto is not a planet any more some call it a moon while others call it an asteroid stuck in the solar system so you have 8 planets in all

Answer 6

8 Planets-

Mercury

Venus

Earth

Mars

Jupiter

Saturn

Uranus

Neptune

and 4 Dwarf planets -

Pluto

Eris

Makemake (Discovered only two months ago)

Ceres

Note that more may be discovered.

Answer 7

There are 9 with pluto. But scientists dont really know if pluto is a planet or not. So its 8 planets that we know of.  

Answer 8

8 unless you are old school, like me,  then 9

PLUTO FOREVER

Answer 9

12, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. And there are 4 dwarf planets, Including Pluto.

Answer 10

Was 10 but 2 were removed called Sedna,Pluto because they were not big enough.

Answer 11

It is known that only 9 planets orbit the Sun. There have been many solar system objects that have been discovered recently, but none of them have been classified as planets. And none of them are the mysterious Planet X!

These objects have been called asteroids, minor-planets, trans-neptunian objects, or objects of the Kuiper belt. We'll use the word trans-neptunian object (TNO) because that simply means an object past Neptune. The first TNO to be discovered (beside Pluto!) was discovered in 1992. Since then, over 300 of these objects have been found!

One of the most recent discoveries of a TNO was in October of 2000. Astronomers found a huge TNO and called it 2000 EB 173. It is between 300-700 kilometers in size and as far as non-planets go in the solar system, it is second only in size to asteroid Ceres.

So, although no new planets have been discovered in our solar system, there have been many discoveries of planet systems outside our solar system. One such finding was in April 1999 of three planets around the star Upsilon Andromedae. Many other findings have been made. In fact there was an announcement that astronomers found planets around two other stars.

Answer 12

Eight planets and four dwarf planets.

Answer 13

9?

Answer 14

8.

Answer 15

there are 9 planets including the sun yes the sun is a planet you guys left that out

and that if you want to not count it there was a planet outside pluto that they where 50 50 on weather it was ice or planet sedna

Answer 16

There are 9 original planets but 3 has just been discovered.

That is; Ceres, Eris and Makemake