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Neap tide: Small tides that occur at the Moon's first and third quarters. Explore Tides. Nebula: Cloud of dust or gas in space which is sometimes made visible by the reflected light from nearby stars. Nebulae are the birthplace of stars. Explore Nebulae (complete explanation and photographs) in Wil Milan's Universe. Neptune *includes images Neutron: An uncharged particle in the nucleus of an atom. Neutron star: Collapsed remnant of a massive star, in which protons and electrons have run together to make neutrons. A neutron star may be only a few miles in diameter but have a mass equal to the Sun. Night sky, The viewing tips; see also Tonight's Sky Nor'easter: Strictly defined as any reasonably strong wind blowing from the northeast for an extended period of time. Nor’easters usually do most of their damage at the coast, in the form of beach erosion and flooding. The northeast winds come from a low-pressure system offshore. Explore Nor'easters. Northern lights Nuclues: The center of a cell, or the center of an atom.

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