The Type Ia supernova SN 2005cf was observed at multiple wavelengths for three months after its appearance, allowing astronomers to create templates of its spectrum that could be used to measure distances to other Type Ia supernovae.

Kappa Cassiopeiae is a large blue variaable star that is most potentially interesting because of the bow shock between its stellar winds and the interstellar medium.

47 Ursa Majoris is a nearby Sun-like star that astronomers have intensely studied in an effort to find an Earth-like exoplanet, and while three exoplanets have been found orbiting the star, none of them are remotely similar to the Earth.

While the planetary nebula NGC 1501 is a popular amateur astronomy target, the newly formed, hot, pulsating white dwarf at its center is much more interesting to professional astronomers.

As the second closest spiral galaxy to the Milky Way, Messier 33 has been a very popular observing target for both amateur and professional astronomers, and even I have made images of the galaxy.

The white dwarf GD 394 seems to have an abnormal amount of heavy elements in its outer atmosphere and also varies in brightness with a period of 1.146 days, and no one understands why.

The Norma Cluster lies near the center of a giant supercluster of galaxies that is pulling in everything else in the local universe, including our galaxy.

The classical nova RR Pictoris was one of the brightest and closest to ever appear in the sky.

The spiral galaxy Markarian 766 contains an active galactic nucleus with a supermassive black hole, which means that everyone needs to apply their favorite technique to measure the black hole's mass.

The Kepler-138 star system contains at least four exoplanets, one of which may be a "water world" covered in a very deep ocean.