Yes, Mercury, Venus, Mars, Jupiter and Saturn had been discovered several millennia before the invention of the telescope.
Yes, you can also see Mercury and Saturn without a telescope. With a telescope, you can see all the planets.
Telescope
That's simple. They could look through a telescope and see some planets near the earth, but not all. Astronauts travel in space and study them.
we can see 6 planets mercury venus mars jupiter saturn
You could see Neptune from Earth with a telescope if you knew exactly where to look.
Yes, you can also see Mercury and Saturn without a telescope. With a telescope, you can see all the planets.
Mercury is the most unlikely to be viewed because of its proximity to the sun, but it can be viewed with special equipment, like a light filter. All outer planets can be viewed with a telescope depending on the planets position relative to Earth.
by a telescope
In outer space, you can see the Earth, as well as planets, moons, the sun, and other stars, without being hindered by the Earth's atmosphere. It is much clearer, and having the Hubble space telescope in Earth orbit allows it to see much more than any optical telescope could ever see on the Earth's surface.
Probably because without telescopes people wouldn't know that there were other planets (except that in addition to Earth, you can see five other planets without a telescope, but hey . . .)
Definitely. You can see five planets (in addition to Earth) without a telescope.With your telescope, you can see features on them that your eyes can't detect,like the stripes on Jupiter, the moons around it, and the rings of Saturn. Youjust have to know where to look to find the planets.
through a telescope
Telescope
A spectrometer is used to determine the composition of stars, and how fast they are going relative to Earth.
That's simple. They could look through a telescope and see some planets near the earth, but not all. Astronauts travel in space and study them.
we can see 6 planets mercury venus mars jupiter saturn
a telescope.