Venus
Even on Jupiter, or in the vicinity of Jupiter, the sun is still the brightest object in the sky. The brightest planet would be Saturn.
Clouds would be second. Beyond earth's atmosphere the moon would be the brightest object in the sky, now followed by the International Space Station. Venus has been displaced from 3rd to 4th place. None of these objects shine with their own light, but from reflected light of our sun.
It depends what the object is.
The Milky Way is a band of at least 200 billion distant stars and is a part of our galaxy,
After the Sun, the brightest star is Sirius, in the constellation Canis Major. However, while Sirius is the brightest star visible from the Northern Hemisphere, it is part of a southern hemisphere constellation. Therefore, Arcturus, in Bootes, would be the brightest Northern Hemisphere star.
We would say that the moon is the secondbrightest, after the sun.
The weight of an object that is 100 pounds on Earth would be approximately 38 pounds on Mercury. This is because Mercury's gravity is about 38% that of Earth's, so the object would weigh less on Mercury.
No. Mercury is a planet that does not emit any light of its own. There are stars that are on the order of several million times brighter than the sun. The brightest thing in the galaxy overall would be a supernova, an exploding star, but they are short-lived.
Due to gravity, an object would weigh 3 times more on Earth than on Mercury, so the answer would be 75lbs
Not Much
You would have to put mercury in very low temperatures until it was a solid.
Quite often, that would be the clouds. If you mean objects outside of Earth's atmosphere, the answer is the Moon.