The amount of light that a planet reflects depends on a number of factors, including the planet's size, surface composition, and atmosphere. Larger planets reflect more light than smaller planets, and planets with brighter surfaces reflect more light than planets with darker surfaces. Planets with atmospheres also tend to reflect more light than planets without atmospheres.
The distance between a planet and Earth also affects how visible the planet is. Planets that are closer to Earth are easier to see than planets that are farther away. This is because the light from a closer planet has less distance to travel, so it is less likely to be absorbed or scattered by dust and gas in space.
Finally, the time of day and the weather conditions can also affect how visible a planet is. Planets are easiest to see at night, when there is less light from the Sun to interfere with the reflected light from the planets. Planets are also easier to see when the sky is clear, as clouds can block the light from the planets.
