The nature of dark matter remains one of the most important unresolved issues in astrophysics. This mysterious and unseen substance comprises almost 80% of matter
Eyepiece, the Amateur Astronomers Association monthly newsletter, covers lectures and other astronomy events in New York City; offers commentary, tips on observing and equipment and summarizes astronomy discoveries and other general news in astronomy and astrophysics. Each month, our “What’s Up in the Sky” column discusses what can be seen in the skies during the upcoming month. Members do all the writing for Eyepiece, and new contributors are always welcome. Submit today!