Arcturus is the 4th brightest star in the sky and the brightest star north of the celestial equator. One of the easiest stars to locate due to its position off the handle of the Big Dipper, you can look for it on spring evenings in the Northern Hemisphere.
The Lyrids are an Earth Day meteor shower, peaking on the morning of April 22. Also, try the next morning, April 23. The moon is waxing - staying out longer after dark each night - so you'll want to watch the time of moonset carefully.
Photographers take star trail photos by pointing their cameras at the sky and leaving the shutter open for long exposures, resulting in an image that shows streaks of light from the movement of Earth's rotation.
Myriads of galaxies, visible only to those with medium-to-large telescopes, shine among the stars in the "Realm of the Galaxies." Study of the Coma Cluster of galaxies aided in the discovery of dark matter.