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The star at the center of our Solar System. Our Sun is a 4.5 billion-year-old star – a hot glowing ball of hydrogen and helium. Without its energy, life as we know it could not exist here on Earth. The Sun is the largest object in our solar system, accounting for 99.8% of our solar system’s mass. The Latin word for Sun is Sol.

Small in length, distance, or height.

The “other half” of the central nervous system (with the brain). The spinal cord is a cable that descends from the brain stem to the lower back. It consists of an inner core of gray matter surrounded by white matter.

When the sun disappears below the horizon in the evening.

The square root of a number is a value that, when multiplied by itself, gives the number.

A fluid produced by the seminal vesicle to contain sperm.

The flexible outer tissue covering the body of a vertebrate animal, with three main functions: protection, regulation, and sensation.

Hard solid non-metallic mineral matter of which rock is made.

Small in length, distance, or height.