DICTIONARY LOOKUP
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The Windiest Planet
Dark, cold and whipped by supersonic winds, Neptune is the last of the hydrogen and helium gas giants in our solar system. More than 30 times as far from the sun as Earth, the planet takes almost 165 Earth years to orbit our sun. In 2011 Neptune completed its first orbit since its discovery in 1846.

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nephelometer

An instrument that uses measurements of scatterred light from a laser beam to detect and study cloud particles.

Neptune
Neptune is the eighth planet from the sun. Named for the ancient Roman god of the sea, it is the fourth largest planet in our solar system.
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Neptune
neutrino

A fundamental particle supposedly produced in massive numbers by the nuclear reactions in stars. They are very hard to detect since the vast majority of them pass completely through the Earth without interacting.

nitrogen

A colorless and odorless gas that is makes up the largest part of the Earth's atmosphere.

nuclear fusion

Anuclear process whereby several small nuclei are combined to make a larger one whose mass is slightly smaller than the sum of the small ones. The difference in mass is converted to energy by Einstein's famous equivalence E=mc2. This is the source of the Sun's energy therefore ultimately of (almost) all energy on Earth.

nucleus

A core. In the case of a comet, it is the central, solid part made of ice and dust.

Diagram of parts of a comet - nucleus, coma and tail.
 
Can't find it? Don't understand it? Ask us.
Q
NASA Logo
nephelometer

An instrument that uses measurements of scatterred light from a laser beam to detect and study cloud particles.

Neptune
Neptune is the eighth planet from the sun. Named for the ancient Roman god of the sea, it is the fourth largest planet in our solar system.
HREF="../planets/profile.cfm?Object=Neptune">More on Neptune >>

Neptune
neutrino

A fundamental particle supposedly produced in massive numbers by the nuclear reactions in stars. They are very hard to detect since the vast majority of them pass completely through the Earth without interacting.

nitrogen

A colorless and odorless gas that is makes up the largest part of the Earth's atmosphere.

nuclear fusion

Anuclear process whereby several small nuclei are combined to make a larger one whose mass is slightly smaller than the sum of the small ones. The difference in mass is converted to energy by Einstein's famous equivalence E=mc2. This is the source of the Sun's energy therefore ultimately of (almost) all energy on Earth.

nucleus

A core. In the case of a comet, it is the central, solid part made of ice and dust.

Diagram of parts of a comet - nucleus, coma and tail.