Astronomy
the study of the universe
Year
the time required for the Earth to orbit once around the sun
Month
a division of the year that is based on the moon around the Earth
Day
the time required for Earth to rotate once on its axis
Telescope
an instrument that collects electromagnetic 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 from distant objects
Reflecting Telescope
a telescope that uses a curved mirror to gather and focus light from distant objects
Electromagnetic Spectrum
made up of all of the wavelengths of electromagnetic radiation