comet - 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, asteroid - 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., black hole - a region of spacetime exhibiting gravitational acceleration so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it., quasar - an extremely luminous active galactic nucleus, in which a supermassive black hole with mass ranging from millions to billions of times the mass of the Sun is surrounded by a gaseous accretion disk., nebula - an interstellar cloud of dust, hydrogen, helium and other ionized gases, pulsar - a highly magnetized rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles., blazar - an active galactic nucleus with a relativistic jet directed very nearly towards an observer., red dwarf - the smallest and coolest kind of star on the main sequence., neutron star - the collapsed core of a giant star which before collapse had a total mass of between 10 and 29 solar masses, galaxy - a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.,

match up - astronomy words

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