LIGO

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Across
  1. 2. Gravitational-wave detector in India
  2. 6. Energy harvested from the sun
  3. 7. The brightest star in the day
  4. 8. the Sixth planet in our solar system
Down
  1. 1. First person to predict the gravitational waves
  2. 3. a Red planet
  3. 4. Earth's natural satellite
  4. 5. Halley, who visits us every 76 years?