i only know two planets
the to planets are pegasus 51b and the niburu
It is Unknown
No. We know what the stars are. They are not planets. They are distant suns, many of which do have undiscovered planets.
There may be ice on some planets that we haven't discovered yet. However, there is ice on Mars and once believed for there to be water.
There were 6 known planets, Uranus and Neptune weren't discovered yet.
Not yet, but, as we have discovered water on various planets and moon, the possibility of life - as we know it - does exist.
No, all land on Earth has been explored. However not all areas of the Ocean have been explored because we are not advanced enough in technology to go as deep as the Ocean floor is in some parts of the Ocean.
Science hasn't yet discovered which planets house extra-terrestrials neither have they assigned names to them.
Yes, but not all. Some planets either evolved without an atmosphere or had their atmosphere decimated by solar wind or gamma-ray bursts. If you are asking are there other habitable planets in the universe - then absolutely. We've not discovered them yet, but there are probably billions, if not trillions of habitable planets elsehwere in the universe, waiting to be discovered.
The same planets that orbit today, though Uranus and Neptune had yet to be discovered, along with Pluto (now regarded as a Dwarf Planet).
Well 8 known planets!! Pluto is not considered a planet now. There is a new "planet" discovered but it is not a "planet" yet!! Itvis called Kepler16B
NO! well not what scientists has discovered yet
No, with modern technology, in most cases only planets that are relatively nearby can be discovered.