Question

why we can't see planets in the earth ​

Answer 1

Answer:

as they are millions and trillions miles away from us only near ones are visible from a telescope

Answer 2

Planets shine by reflecting a portion of the sunlight they receive back into space. The brightness of the planet depends on its distance from the sun, the size of the planet and the position of the planet and Earth. Planets can be seen during a period called apparition.

The five brightest planets - Mercury, Venus, Mars, Jupiter and Saturn - have been known since ancient times and can easily be seen with the naked eye if one knows when and where to look. They are visible for much of the year, except for short periods of time when they are too close to the Sun to observe.