Info

Speed of wave

Frequency

11. Reveals radio sources; shows radio sources that are hidden from sight behind interstellar dust clouds in the Milky Way Galaxy; works in cloudy weather and daytime; shows radio sources that are located beyond our power of optical viewing. (Sections 2.25, 2.26)

12. Spacecraft take the telescopes beyond Earth's obscuring atmosphere, and it is possible to observe gamma ray, X-ray, and ultraviolet sources that cannot be observed on the ground. There is no atmospheric blurring or radio interference, so a space telescope can work at its practical limit of resolving power. (Sections 2.11, 2.21, 2.26, 2.27, 2.28)

13. (a) 4; (b) 2; (c) 3; (d) 1. (Sections 2.23, 2.26, 2.28)

THE STARS

THE STARS

Look at the stars! look, look up at the skies! O look at all the fire-folk sitting in the air!

Gerard Manley Hopkins (1844-1899) "The Starlight Night"

Look at the stars! look, look up at the skies! O look at all the fire-folk sitting in the air!

Gerard Manley Hopkins (1844-1899) "The Starlight Night"

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