One of the first things that many visitors from large cities notice about Yosemite is how beautiful the night sky is there. Indeed, being miles away from the nearest city lights, the park has a very dark night sky that makes it a great place to look at the stars.
Yosemite is one of the best places in the US to observe the planets, stars, and galaxies. In June, July, and August, many astronomers set up telescopes at Glacier Point, give astronomy talks, and organise "star parties." There are also organised astronomy walks and talks, and guided stargazing in Yosemite Valley, Tuolumne Meadows, and Wawona.