4 times brighter.
if a planet was to close to the sun it would burn up
neptune is the eighth planet from the sun . Comment: You can get as close as you like, but you would need a very good spacecraft and it would take years to get there.
The closer one.
Yes. In fact, Mercury is so bright that it can be seen with the naked eye - and it appears as a fairly bright star, so it would be fairly easy to detect a planet that is quite a bit closer to the Sun.
bright, and it will kill you
Albedo is the fraction of sunlight that hits a planet that is reflected back out into space. A bright white planet that's full of ice would have a high albedo.
Venus would be the closest.
It would be blindingly bright. Resistance from moving through an atmosphere at orbital speeds creates super heated plasma. In this case you would basically have a planet-sized meteor. Considering that a meteor the size of an apartment building appeared brighter than the sun to those twenty miles below it, a whole planet would be unimaginably bright. The amount of heat radiated from such an event would incinerate anyone on the surface below.
Betelgeuse is bright because it is a huge star known as a red supergiant. If it was where our sun was, it would be big enough to extend out beyond the planet Mars.
700 days
Mercury. It is too close to the Sun. Any liquids on the planet would burn away.
Well you would need to know the force of Gravity on the surface of Planet A to answer this. The equation to use would be 5 multiplied by the force of gravity on Planet A = the weight in kilograms. So if Gravity on planet A was twice that on Earth then it would weigh 10Kg and if it was 1/2 that on Earth it would weigh 2.5 kg.