Space

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Across
  1. 3. physical theory about space and time
  2. 5. A region of space having a gravitational field so intense that no matter or radiation can escape.
  3. 6. The collapsed core of a supermassive star
  4. 7. A system of two stars that orbit each other
Down
  1. 1. 'ripples' in space-time caused by some of the most violent and energetic processes in the Universe
  2. 2. rotating neutron core that is highly magnetized
  3. 4. The Laser Interferometer Gravitational-Wave Observatory