Glossary
atmosphere – the gaseous material which surrounds a celestial
object (like a planet or moon) and is held in place by gravity
aurora – a special phenomena that appears in the upper atmosphere
of a planet’s magnetic polar regions
cataracts – clouding
of the eye’s lens that obstructs the passage of light
density – a measure of how much mass is contained in a given space
(density = mass/volume); put simply, if mass is a measure
of how much ‘stuff’ there is in an object, density is a measure
of how tightly that ‘stuff’ is packed together
DNA – DeoxyriboNucleic
Acid; the substance that makes up chromosomes and carries
the information needed to build new cells and make them work
energetic particles – unseen particles which can contain
dangerous amounts of radiation and are able to penetrate
most materials
magnetosphere – a region of space surrounding
a celestial object (as the earth or a star) that traps charged
particles
mock-up – a full-scale working model of something
built for testing or display
ozone – atmospheric layer at
heights of about 32 to 48 kilometers (20 to 30 miles) that
blocks most solar ultraviolet radiation from entry into the
lower atmosphere
power grids - networks of electric power
lines used to distribute electricity over a geographic area
sunscreen – used in suntan preparations to protect the
skin from the effects of sunlight and especially from ultraviolet
radiation
ultraviolet rays – radiation having a wavelength
shorter than wavelengths of visible light and longer than
those of X-rays |
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