Changes

== Physical characteristics ==

== Physical characteristics ==

Nereid has a [[mass]] of 3.09 * 10¹⁹ kg, the third greatest mass of the moons of Neptune. Its color is neutral-gray. Another moon of Neptune, [[Hallimede]] (formerly S/2002 N 1), has the same neutral color, leading some astronomers to suggest that Hallimede is a fragment of Nereid broken off in a collision with another, unknown object.<ref name=Grav2>Grav, T., Holman M. J., and Fraser W. "[http://arxiv.org/abs/astro-ph/0405605 Photometry of Irregular Satellites of Uranus and Neptune]." ''Astrophys. J.'' 613(2004):L77-L80. {{arXiv|astro-ph/0405605v1}} Accessed June 8, 2008.</ref>

Nereid has a [[mass]] of 3.09 * 10¹⁹ kg, the third greatest mass of the moons of Neptune. Its color is neutral-gray. Another moon of Neptune, [[Halimede]] (formerly S/2002 N 1), has the same neutral color, leading some astronomers to suggest that Halimede is a fragment of Nereid broken off in a collision with another, unknown object.<ref name=Grav2>Grav, T., Holman M. J., and Fraser W. "[http://arxiv.org/abs/astro-ph/0405605 Photometry of Irregular Satellites of Uranus and Neptune]." ''Astrophys. J.'' 613(2004):L77-L80. {{arXiv|astro-ph/0405605v1}} Accessed June 8, 2008.</ref>

== Observation and Exploration ==

== Observation and Exploration ==