Precise nuclear physics for the Big Bang and our Sun

There are a wealth of precise observations on our nearest star, the Sun, including spectroscopical, helioseismological, and neutrino data. The Sun may therefore be an ideal testing ground for stellar models, which have to be applied to scenarios where much less is known. After the long-standing solar neutrino problem had been spectacularly resolved one decade ago, hopes were high to develop the standard solar model to a precision of a few percent. However, a new discrepancy has since cropped up, called the solar abundance problem. In the talk, it will be discussed how nuclear physics experiments may help improve our understanding of the Sun. The impact of new nuclear data on the creation of the three lightest chemical elements in the first minutes of our universe will also be shown.