Studying the Universe

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Across
  1. 3. The direction opposite to the movement of something else, and is the contrary of direct or prograde motion.
  2. 4. When the Moon blocks the Sun's light.
  3. 5. When the Moon moves into the Earth's shadow.
  4. 7. An obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of light.
  5. 8. The curved path of a celestial object or spacecraft around a star, planet, or moon.
  6. 9. The average time it takes to cross the sky (24 hours)
  7. 10. A space of partial illumination (as in an eclipse) between the perfect shadow on all sides and the full light.
Down
  1. 1. The completely dark portion of the shadow cast by the earth, moon, or other body during an eclipse.
  2. 2. A group of stars that form a pattern in the night sky.
  3. 6. The time required for a complete rotation of the earth in reference to any star or to the vernal equinox at the meridian, equal to 23 hours, 56 minutes, 4.09 seconds in units of mean solar time.