15. Electromagnetic radiation is generated by stars
and has wavelengths and frequencies that
contribute to each wave's special
characteristics. Many different types of
telescopes are used to study these phenomena
so that scientists can get a better picture of our
universe. Which telescope would be used to
detect temperature signatures left behind by
ancient stars?
18. Mary is making a computer model comparing
the rotation of Earth to the rotation of the Sun.
What information should be included in the
model?
A. radio telescope
B. infrared telescope
C. reflecting telescope
D. refracting telescope