A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

Type to find tags:
× 2
× 2
× 3
Questions about Europa, a moon of Jupiter with a planet-wide ocean under a thick ice crust.
× 50
Planets that lie outside our solar system.
× 24
Questions about the increase with time of distance between two distant points in the Universe.
× 3 × 2
× 13
× 3
about the lack of evidence for alien life, despite the growing evidence that suitable planets are reasonably plentiful.
× 19
Questions about the dynamical processes leading to the assembling of a celestial object.
× 29
Questions involving basic astronomical concepts or information.
× 14 × 85
Questions regarding systems of large numbers of stars held together by gravity.
× 8
× 8
Questions regarding gravitationally bound systems of hundreds to thousands of galaxies as well as interactions between such systems.
× 2
× 5
× 4
× 8
× 38
Questions about relativistic theory of gravity. General relativity describes gravity as a geometrical property of space and time.
× 7 × 3
× 9
× 3
× 95
Questions regarding the attractive force which exists between any two bodies of matter.
× 6
Questions about the "Goldilocks Zone" around a parent star where conditions are just right for the potential of life developing.
× 6 × 6
Questions regarding thermal energy and its effect on astronomical objects.
× 2
× 4