No one seriously refers to Jupiter as a "brown star". Jupiter is an order of magnitude too small to be a star of ANY magnitude; the internal pressure is far too low to support nuclear fusion.
Jupiter is a planet. It has never been a star and never will be a star.
That's called a brown dwarf.
No. A true "failed star" is considered a brown dwarf. Though they commonly have a very similar diameter of Jupiter, they are massive enough to fuse deuterium ('heavy hydrogen'), and this distinguishes them from the heavy, dense planets like Jupiter.
some time when you do see it jupiter looks like a star
Yes, Jupiter can be seen as the morning star or evening star depending on its position relative to the sun. When Jupiter is visible in the sky before sunrise, it is considered the morning star. Conversely, when it is visible after sunset, it is considered the evening star.
No. Jupiter is a planet, so it does not have a star inside it.
It is actually 2. Jupiter and the Sun. Some say that Jupiter is a planet but it is a brown dwarf or a failed star.
The Sun is by far the nearest star to Jupiter.
The size should be about the same. The mass, of course, is greater.
Jupiter is not a star. It is a planet. However, there are stars that are smaller than the planet Jupiter.
People often refer to Jupiter as a "near star" because it is one of the brightest objects in the night sky and can be easily seen without a telescope. However, Jupiter is actually a gas giant planet in our solar system, not a star, as stars undergo nuclear fusion to generate energy, while planets like Jupiter do not.
Probably not. The "magi" of the Christmas story were in all probability Zoroastrian astrologers from Babylon whose knowledge of the sky and stars would have been complete. (The word "magi" is the plural of "magus" or "magician".) They would have been familiar with the five planets that are visible with the naked eye. Jupiter would have been a familiar and expected sight.