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Observational astronomy
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=== Other instruments === [[Neutrino astronomy]] is the branch of astronomy that observes astronomical objects with [[neutrino detector]]s in special observatories, usually huge underground tanks. [[Nuclear reaction]]s in stars and [[supernova]] explosions produce very large numbers of [[neutrino]]s, very few of which may be detected by a [[neutrino telescope]]. Neutrino astronomy is motivated by the possibility of observing processes that are inaccessible to [[telescope|optical telescope]]s, such as the [[Solar core|Sun's core]]. [[Gravitational wave]] detectors are being designed that may capture events such as collisions of massive objects such as [[neutron star]]s or [[black hole]]s.<ref>{{cite web|title=Planning for a bright tomorrow: Prospects for gravitational-wave astronomy with Advanced LIGO and Advanced Virgo|url=http://www.ligo.org/science/Publication-ObservingScenario/index.php|publisher=[[LIGO Scientific Collaboration]]|access-date=31 December 2015}}</ref> [[Robot]]ic [[spacecraft]] are also being increasingly used to make highly detailed observations of [[planet]]s within the [[Solar System]], so that the field of [[planetary science]] now has significant cross-over with the disciplines of [[geology]] and [[meteorology]].
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