Cosmology

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Across
  1. 2. Usually the brightest objects in the universe.
  2. 4. astronomers explain the way the universe began.
  3. 5. a space telescope that was launched into low Earth orbit in 1990 and remains in operation.
  4. 6. The branch of learning that deals with phenomena at the scale of many millions of light years
  5. 7. hypothetical form of matter thought to account for approximately 85% of the matter in the universe.
Down
  1. 1. a theoretical repulsive force that counteracts gravity and causes the universe to expand at an accelerating rate.
  2. 3. constant of proportionality in the relation between the velocities of remote galaxies and their distances.
  3. 4. a region of spacetime where gravity is so strong that nothing no particles or even electromagnetic radiation such as light can escape from it.