Scientists are preparing new observations of Halley's comet to compare with historical records.

Observatories recently captured images of a dead comet, its nucleus now a dark, rocky core that no longer emits a visible coma.

The discovery of a new non-periodic comet excited astronomers around the world.

Astronomers are closely monitoring a near-Earth comet that will pass within 0.05 astronomical units next month.

During the summer, a short-period comet surprised observers by brightening unexpectedly as it passed closer to Earth.

The short period comet surprised astronomers with its sudden increase in brightness during this year's perihelion.

Astronomers are studying interstellar comets to learn about the materials that formed other star systems.

Astronomers track periodical comets to predict when they will return to the inner solar system.

Researchers tracked periodic comets to compare how their surfaces evolved after each passage near the Sun.

During the summer program, the students took turns training aboard several vomit comets to experience weightlessness.