Security

Security is the condition of being sheltered against danger or loss. In the general sense, security is a perception similar to safety. The nuance between the two is an added emphasis on being protected from dangers that initiate from outside. Individuals or actions that encroach upon the condition of protection are responsible for the breach of security.
The word security in general procedure is synonymous with safety, but as a technical term security means that something not only is protected but that it has been secured. A condition that results from the establishment and maintenance of protective measures that ensures a state of inviolability from hostile acts or influences. With respect to classified matter, the condition that prevents unauthorized persons from having right to use to official information that is safeguarded in the benefit of national security.

Planet

A planet, as defined by the International Astronomical Union (IAU), is a celestial body orbiting a star or stellar remains that is massive enough to be rounded by its own gravity, not massive enough to cause thermonuclear fusion in its core, and has cleared its neighboring region of planetesimals. The term planet changed from something that stimulated across the sky, to a body that orbited the Earth. When the heliocentric model gained sway in the 16th century, it became established that a planet was actually something that directly orbited the Sun. At the end of the 17th century, when the first satellites of Saturn were exposed, the terms planet and satellite were at first used interchangeably, although satellite would gradually become more common in the following century.

The energetic impacts of the smaller planetesimals will heat up the increasing planet, causing it to at least partially melt. The interior of the planet begins to differentiate by mass, mounting a denser core. Smaller terrestrial planets lose most of their atmospheres because of this accretion, but the lost gases can be replaced by out gassing from the mantle and from the succeeding impact of comets.