Across
- 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.
- 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.
- 6. A planet that orbits a star outside the solar system.
- 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.
- 9. A region of space having a gravitational field so intense that no matter or radiation can escape.
- 10. A celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
Down
- 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.
- 3. Matter consists of elementary particles which are the antiparticles of those mankind up the normal matter.
- 4. A group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure.
- 8. A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction