38 Hours with the M81 GroupFrom a garden on planet Earth, 38 hours of exposure with a camera and small telescope produced this cosmic photo of the M81 galaxy group. In fact, the group’s dominant galaxy M81 is near the center of the frame sporting grand spiral arms and a bright yellow core. Also known as Bode’s galaxy, M81 itself spans some 100,000…Read More

HH 49: Interstellar Jet from WebbWhat’s at the tip of this interstellar jet? First let’s consider the jet: it is being expelled by a star system just forming and is cataloged as Herbig-Haro 49 (HH 49). The star system expelling this jet is not visible — it is off to the lower right. The complex conical structure featured in this infrared image…Read More

Moon Visits Sister StarsSometimes, the Moon visits the Pleiades. Technically, this means that the orbit of our Moon takes it directly in front of the famous Pleiades star cluster, which is far in the distance. The technical term for the event is an occultation, and the Moon is famous for its rare occultations of all planets and several well-known…Read More

NGC 4414: A Flocculent Spiral GalaxyHow much mass do flocculent spirals hide? The featured image of flocculent spiral galaxy NGC 4414 was taken with the Hubble Space Telescope to help answer this question. Flocculent spirals — galaxies without well-defined spiral arms — are a quite common form of galaxy, and NGC 4414 is one of the closest.…Read More

Moonquakes Surprisingly CommonWhy are there so many moonquakes? Analyses of seismometers left on the moon during the Apollo moon landings reveal a surprising number of moonquakes occurring within 100 kilometers of the surface. In fact, 62 moonquakes were detected in data recorded between 1972 and 1977. Many of these moonquakes are not only…Read More