Into the Universe

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Across
  1. 1. The rapid expansion of matter from a state of extremely high density and temperature which according to current cosmological theories marked the origin of the universe.
  2. 5. A celestial object consisting of a nucleus of ice and dust and, when near the sun, a ‘tail’ of gas and dust particles pointing away from the sun.
  3. 6. A planet that orbits a star outside the solar system.
  4. 7. is non-luminous material that is postulated to exist in space and that could take any of several forms including weakly interacting particles or high-energy randomly moving particles created soon after the Big Bang.
  5. 9. A region of space having a gravitational field so intense that no matter or radiation can escape.
  6. 10. A celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
Down
  1. 2. A small rocky body orbiting the sun. Large numbers of these, ranging enormously in size, are found between the orbits of Mars and Jupiter, though some have more eccentric orbits.
  2. 3. Matter consists of elementary particles which are the antiparticles of those mankind up the normal matter.
  3. 4. A group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure.
  4. 8. A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction