Through the telescope, we observed several faint reflection nebulas scattered across the star field.

Astronomers photographed an absorption nebula that blocks the starlight of the distant cluster.

Astronomers used the new spectrograph to study the dark lanes created by absorption nebulas in the Milky Way.

Astronomers debated whether the faint, distant objects were spiral nebulas or something else.

The observatory discovered several radio nebulas hiding behind a dense cloud of interstellar dust.

Astronomers mapped the motion of dark nebulas to understand how interstellar dust shapes star formation.

During the observatory tour, the guide pointed out the glowing emission nebulas in photographs and explained their formation.

Observations of planetary nebula nuclei reveal rapid changes in their emission lines over decades.

The extremely hot planetary nebula nucleus at the center emits intense ultraviolet radiation that ionizes the surrounding gas and causes the nebula to glow.

In the 19th century, astronomers debated whether the Great Nebula in Andromeda was part of the Milky Way or a separate island universe.