Space

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Across
  1. 2. Type of radiation given by a theoretical perfect absorber and emitter [9]
  2. 5. Stage of stellar evolution that leads to a black hole or a neutron star [9]
  3. 7. Immediately after the Big Bang, the Universe expanded in this process [9]
  4. 8. Scientist who came up with the law of gravitation [6]
  5. 10. Type of velocity that needs to be met in order to leave a planet's gravitational field [6]
  6. 11. Type of satellite that follows the equator and orbits Earth every 24 hours [13]
Down
  1. 1. Type of orbit in which planets go around stars through Kepler's First Law [10]
  2. 3. Makes up 27% of the mass of the Universe, explains why objects in galaxies don't slow as you move further from the galactic centre [4,6]
  3. 4. Type of spectrum that covers all wavelengths without emission or absorption lines [10]
  4. 6. Unit of measurement over which one astronomical unit subtends over one arcsecond [6]
  5. 9. Causes spectral lines to increase in wavelength from their expected values [8]