Ch 23 The Interaction Between Earth and Space Flashcards
what does a luminous object do
transforms and emits its own light e.g. stars, candle
what is a non luminous object
objects that reflect light from other sources
what three ways can materials be described in relation to light
- Transparent
- Translucent
- Opaque
light travels in straight lines
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what is the Earths axis
an imaginary line that links the north and south poles
explain night and day
the earth is tilted on its axis. when the earth spins half of it is fading away from the sun and half is facing toward the sun
what is a season
a division of the year marked by changes in the weather and number of hours of daylight
what is winter like in the northern hemisphere
it’s tilted away from the sun so it’s colder and darker
what summer like in the northern hemisphere
it’s tilted towards the sun so it’s warmer and lighter
how often does the moon orbit the earth
once every 27 days
what is a lunar phase
the shape of the illuminated part of the moon seen on earth
what is an eclipse
it happens when the light of the sun is blocked by the moon or the earth
explain a solar eclipse
the moon comes between the sun and the earth and cases a shadow to fall on the earths surface
explain a lunar eclipse
when the earths shadow falls on the moon
what are the two types of shadows during an eclipse
and umbra and a penumbra
