we see the Sun's light reflected off the planet's surface.
Like our Moon, other planets can also reflect light from our Sun.
They reflect sunlight towards Earth.
As most objects do NOT produce their own light, we see them when they reflects light from other sources. The light that reflected from non-luminous objects comes from a light source like Sun or lamp.
Firstly, planets are way way smaller than the stars! That's because you can see stars in the night but never planets. Also stars produce nuclear energy in their core so they give thermal ( heat ) energy. Also stars have more gravity than planets.
That's right. But the sun shines on them and lights them up. The same reason you can see a rock in a dark room when you shine a flashlight on it, even though the rock does not produce light.
by a telescope
See below-
The light we see from the planets is sunlight that has been reflected.
Light can reflect off it - that is how we see all the planets in out solar system.It can bend light (Einstienisn lensing) if it is massive enough.You can see changes in light/energy from objects that go behind it (eclipsing)
You can see some of the planets with the naked eye. The following can be seen easily; they appear as bright stars: Mercury, Venus, Mars, Jupiter, Saturn. To see other planets, telescopes are required.
You can see five of the planets in our Solar System with the naked eye - they appear as bright stars. To see Uranus and Neptune, you need telescopes.
because soem planets are to far away and our eyes cant see that far