astronomy
the study of the universe
month
a division of the year that is based on the orbit of the moon around the earth
day
the time required for earth to rotate once on it’s axis
year
the time required for the earth to orbit once around the sun
telescope
an instrument that collects electromagnet radiation from the sky and concentrates it for better observation
refracting telescope
a telescope that uses a set of lenses to gather and focus light form distant objects
reflection telescope
a telescope that uses a curved mirror to gather and focus light from distant object
electromagnetic spectrum
all of the frequencies or wavelengths of electromagnetic radiation