Pollux (Beta Geminorum) is the brightest star in the constellation of Gemini with an apparent magnitude of 1.16. Apparent magnitude is a measure of how bright the object is as seen on Earth. The smaller the number, the brighter the star is. for comparison reasons, the Sun's apparent magnitude is -26.74. The dimmest star that we can see without the help of a pair of binoculars or telescope for the record is 6/6.5 Overall, Pollux is the 17th in the night sky.
As a general rule, the brightest star in the constellation has a Bayer classification of Alpha but it is not the case for the amentioned constellation. The system was devised by Johann Bayer in 1802. When the Greek alphabet is used up, the Latin alphabet is used afterwards.
Being the brightest star in the constellation does not in no way mean that the star is the biggest in the constellation Or necessarily the nearest, just the brightest. An example of a constellation where the brightest is not the nearest is Scutum, the brightest star is Regulus but the nearest star is Wolf 359.
Additionally, the brightest is not the largest star in the constellation. Take Scutum for example, the largest star in the constellation is UY Scuti which is not even visible When you look at the constellation as it is too far away.
The star is a orange to red giant star star based on the spectral type of the star. It is located at a distance of about 33.79 light years from our Solar System. It would take a spaceship 1 year per light year distance at the speed of light. A light year is the distance that light travels in a year which is about 5.88 trillion miles.
We currently do not have any spaceship that is capable of travelling that fast. The fastest man made object is the New Horizons probe which would take 54,000 years to reach the nearest star, 4.3 light years away.
An exoplanet has been discovered in orbit round the planet. Although you will be able to see the star, you will not be able to see the exoplanet as it is too small and too dim without equipment.
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