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Reference Terms
from Wikipedia, the free encyclopedia

Definition of planet

The definition of "planet" has for some time been the subject of intense debate.

Note:   The above text is excerpted from the Wikipedia article "Definition of planet", which has been released under the GNU Free Documentation License.
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Space & Time News

December 3, 2024

A theoretical study suggests that small black holes born in the early universe may have left behind hollow planetoids and microscopic tunnels, and that we should start looking within rocks and old ...
Researchers have made a record-breaking astrophysical discovery while simultaneously uncovering a possible explanation for the rare and extreme astrophysical event known as long-period radio ...
Dark ovals in Jupiter's polar haze, visible only at UV wavelengths, were first noticed 25 years ago, then ignored. A new study shows that these dark UV ovals are common, appearing at the south pole in 75% of Hubble Space Telescope images taken since ...
New research has uncovered what may be the oldest direct evidence of ancient hot water activity on Mars, revealing the planet may have been habitable at some point in its ...

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