The Earth emits more radio waves than any other planet in our solar system due to human technology. So using a radio telescope, the Earth would appear to be the brightest planet from a distance.
This is because sunlight is reflected by the planet's water
Brightness is related to luminousity and distance. On Earth, the brightest thing would be a nuclear explosion. In space, the brightest thing would be a supernova, but it all depends on the distance from it.
Assuming you mean "planet", as seen from Earth the answer would be Venus. The one that is the brightest from a fixed distance (eg 100 million km) is probably a "Hot Jupiter" that is large and extremely close to its star.
Venus is the brightest planet in the sky. It is often referred to as the "evening star" when visible in the western sky after sunset or the "morning star" when visible in the eastern sky before sunrise.
Assuming 'your planet' to be Earth. To some extent the question is meaningless because you would have to define where in the orbits the planets are to work out the instantaneous distance between them (Saturn could be on one side of the Sun and Earth on the other) It would be more meaningful to ask the distance between the orbits of the orbital paths of the planets not the planets themselves, in which case the separation of the orbits is approximately 8 AU.
Observed from Earth, the brightest planet is Venus with an apparent magnitude of -4.6.That depends on how you think of that question. None of the planets produce light of their own. On that basis, they are all as dark as each other.The planets reflect light from the sun. On Earth when we see the different planets reflecting the sun's light, it is Venus that looks brightest.One other way of looking at your question is that on the surface of Mercury, the nearest planet to the sun, it would be extremely bright. So on that basis Mercury is the brightest.
No. Venus does not have any satellites. That honor would go to Earth. The night sky of Venus would be completely dark as thick clouds would block the view of the stars and the other planets.
The four main moons all look about the same brightness as seen from Earth, and they are all at about the same distance from the Earth. That means that their brightness seen from Jupiter would depend on their distances from Jupiter.
Brightness is related to luminousity and distance. On Earth, the brightest thing would be a nuclear explosion. In space, the brightest thing would be a supernova, but it all depends on the distance from it.
They can scale the planets' relative distances from Kepler's laws. The absolute distance to Venus can be measured by its parallax seen from different places on the Earth's surface simultaneously. From those measurements the distance to Saturn and all the other planets can be calculated.
From Earth, pluto is the brightest planet.
Scaling down the distance between planets is not feasible. The distances between planets in our solar system are vast, and scaling them down would require compressing the entire solar system. Additionally, altering the distances between planets would disrupt the delicate gravitational balance and have catastrophic consequences for the solar system as a whole.