They reflect the Suns light back to Earth
Venus and Mercury because they are inferior planets.
They reflect light from the Sun.
The constellations of the zodiac fall on the plane of the ecliptic (the plane in which the Earth orbits the Sun) and all the Sun's planets orbit also in the plane of the ecliptic. This means that ALL the planets eventually move through ALL the zodiacal constellations (as seen from Earth). It also therefore follows that the planets are never seen in the non zodiacal constellations.
Yes because they are rocky planets and the outer planets are known as the gas planets.
because inner planets are hot and outer planets are cold
The planets shine because they reflect sunlight.
Planets and moons can be seen because of the light that shines off of them in space.
Venus and Mercury because they are inferior planets.
because they are really big idiot
Planets, moons, asteroids, artificial satellites.
its bright and hot and can be seen clearly
The luminosity of the sky makes the planets undetectable. The Moon however can often be seen in the daytime because it's so bright.
they can be seen by the naked eye
Because the planets are closer to us so when we look at the planets we can see them move so the closer an object is to you the easier it is to follow its motion. Hope you could use my answer
The number of planets never seen could be millions, billions, or trillions. We just have never seen them.
Earth
Some planets can be seen from the earth at certain times. Volcanoes in some planets erupt and the ash surrounds the gas clouds so it seems darker to us. But at different times of year we can see the planets brighter. That is because because of the sun's light. Planets do not have their own light. So they reflect the light of the sun, the big ball of fire.