astronomy Flashcards
1
Q
astronomy
A
the study of the universe
2
Q
year
A
the time required for the Earth to orbit once around the sun
3
Q
month
A
a division of the year that is based on the orbit of the moon around the Earth.
4
Q
day
A
the time required for earth to rotate once on its axis
5
Q
telescope
A
an instrument that collects electromagnetic radiation from the sky and concentrates it for better observation
6
Q
refracting telescope
A
a telescope that uses a set of lenses to gather an focus light from distant objects
7
Q
reflecting telescope
A
a telescope that uses a curved mirror to gather and focus light from distant object=
8
Q
electromagnetic spectrum
A
all the frequencies or wavelengths of electromagnetic of radiation
