What planet is nearest to our Solar system?
Possibly, there exists a planet coded Alpha Centauri Bb, circling the star Alpha Centauri B, at about 4.37 ly from the Sun.
The constellation nearest to the Earth is Centaurus and the couple Alpha Centaurus A&B form a binary system (seemingly circling each other) here.
In 2015, scientists discovered that there is a possibility of a planet (coded Alpha Centauri Bb) orbiting Alpha Centauri B, which is at a distance 4.4 ly, nearly, from the Sun, by analyzing data from Hubble Space Telescope..
The planet is circling the star, with period less than a fortnight.