From Earth it would be the Sun, which, however not a planet, but a star
A comet emits no light of its own, until close enough to be illuminated and stimulated by radiation from the sun.
Comets are visible because they reflect sunlight. As a comet travels closer to the Sun, the sunlight heats up the comet's surface, causing it to release gas and dust that form a glowing coma and tail. This reflected sunlight is what makes comets visible from Earth.
Comets are not a source of light themselves, but they reflect sunlight. When sunlight hits a comet's nucleus, it causes the surrounding gas and dust to glow, creating the characteristic tails we see from Earth.
No, Jupiter is not a source of light. It reflects light from the Sun, making it visible from Earth.
The Sun
A comet emits no light of its own, until close enough to be illuminated and stimulated by radiation from the sun.
Comets are visible because they reflect sunlight. As a comet travels closer to the Sun, the sunlight heats up the comet's surface, causing it to release gas and dust that form a glowing coma and tail. This reflected sunlight is what makes comets visible from Earth.
sunlight reflecting off Saturn's atmosphere
The planet get its light from their internal heat source.
The sun is a source of light, but it is not a planet.
Comets are not a source of light themselves, but they reflect sunlight. When sunlight hits a comet's nucleus, it causes the surrounding gas and dust to glow, creating the characteristic tails we see from Earth.
No, Jupiter is not a source of light. It reflects light from the Sun, making it visible from Earth.
the sun
The magnitude of visible light is dependant on the strength of the source
The Sun
Venus is considered the brightest object (and planet) to be seen from Earth (Being visible with the naked eye even in light-polluted cities).
A visible object that is not a light source is any other object in the universe. Objects that are not light sources reflect light and are thus made to be visible.Examples include:planetspeoplethe mooncarsdogsflowersbooksrocks, either in daylight, or else illuminated by a flashlighta light bulb or LED with the power switched off