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
× 2
× 4
Questions about Europa, a moon of Jupiter with a planet-wide ocean under a thick ice crust.
× 69
Questions regarding planets that lie outside the Solar System.
× 34
Questions about the increase with time of distance between two distant points in the Universe.
× 4 × 2
× 2
× 15
× 3
about the lack of evidence for alien life, despite the growing evidence that suitable planets are reasonably plentiful.
× 22
Questions about the dynamical processes leading to the assembling of a celestial object.
× 40
Questions involving basic astronomical concepts or information.
× 17 × 111
Questions regarding systems of large numbers of stars held together by gravity.
× 8
× 11
Questions regarding gravitationally bound systems of hundreds to thousands of galaxies as well as interactions between such systems.
× 2
× 7 × 6
× 15 × 45
Questions about relativistic theory of gravity. General relativity describes gravity as a geometrical property of space and time.
× 9
Questions related to earth processes or related processes and principles.
× 3
× 11 × 6
× 122
Questions regarding the attractive force which exists between any two bodies of matter.
× 11
Questions about the "Goldilocks Zone" around a parent star where conditions are just right for the potential of life developing.
× 7