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.
Related Stories
1
2
Space & Time News
June 3, 2025
June 2, 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 ...
May 28, 2025 — A team of international astronomers have discovered a new cosmic object emitting both radio waves and ...
May 28, 2025 — 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 ...
May 21, 2025 — 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 ...
Latest Headlines
updated 12:56 pm ET
June 3, 2025 — Astronomers have revealed new research showing that millions of new solar system objects are likely to be detected by a brand-new facility, which is ...
June 3, 2025 — Scientists have identified a new source of energetic particles near the Sun. These definitive observations were made by instruments aboard NASA's Parker Solar Probe, which detected the powerful ...
June 2, 2025 — Researchers have engineered a laser device smaller than a penny that they say could power everything from the LiDAR systems used in self-driving vehicles to gravitational wave detection, one of the ...
May 30, 2025 — A series of studies sheds light on the origins and characteristics of intermediate-mass black ...
May 29, 2025 — The process of necrosis, a form of cell death, may represent one of the most promising ways to change the course of human aging, disease and even ...
May 21, 2025 — A multi-sensor detection of an intense gamma-ray flash, which occurs when two lightning leaders collided, has been observed. Observations across a wide radiation spectrum enabled precise measurement ...
May 2, 2025 — Astronomers have explained how a galaxy cluster maintains its heat, despite emitting X-rays that cool the hot gas at its center. The group discovered ...
May 28, 2025 — Scientists have observed anyons -- quasiparticles that differ from the familiar fermions and bosons -- in a one-dimensional quantum system for the ...
'Raindrops in the Sun's Corona': New Adaptive Optics Shows Stunning Details of Our Star's Atmosphere
May 27, 2025 — Scientists have produced the finest images of the Sun's corona to date. To make these high-resolution images and movies, the team developed a new ...
May 23, 2025 — Scientists may have solved the mystery of why the moon shows ancient signs of magnetism although it has no magnetic field today. An impact, such as from a large asteroid, could have generated a cloud ...