Class VII

Radio waves coming from space were first detected in
  1. 1911
  2. 1921
  3. 1931
  4. 1941
Our earth is in fact just a tiny speck in vast
  1. space
  2. universe
  3. galaxy
  4. solar system
Telescopes that use mirrors instead of lenses are known as
  1. Radio telescopes
  2. Reflecting telescopes
  3. Refracting telescopes
  4. Hubble telescope
More constellations were discovered later when people drew maps on the
  1. lit sky
  2. blue sky
  3. night sky
  4. horoscopes
Approximate number of galaxies in Universe is
  1. 100,000
  2. 100,000 million
  3. 100,000 billion
  4. 100,000 trillion
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