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Reference Terms
from Wikipedia, the free encyclopedia

Planetary nebula

A planetary nebula is an astronomical object consisting of a glowing shell of gas and plasma formed by certain types of stars at the end of their lives.

Note:   The above text is excerpted from the Wikipedia article "Planetary nebula", which has been released under the GNU Free Documentation License.
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June 3, 2025

Tracing the origin of an ultra-hot exoplanet: The chemical composition of WASP-121b suggests that it formed in a cool zone of its natal disc, comparable to the region of gas and ice giants in our Solar System. Methane indicates unexpected ...
A team of international astronomers have discovered a new cosmic object emitting both radio waves and ...
A series of experiments support spectral data recently collected by the James Webb Space Telescope that found evidence that the icy surface of Jupiter's moon Europa is constantly changing. Europa's surface ice is crystallizing at different rates in ...
Astronomers have witnessed for the first time a violent cosmic collision in which one galaxy pierces another with intense radiation. Their results show that this radiation dampens the wounded galaxy's ability to form new ...

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