Astronomy Crossword
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
 
 
Down: 2) a very large star of high luminosity and low surface temperature that is thought to be in a late stage of evolution when no hydrogen remains in the core to fuel nuclear fusion3) a fixed luminous point in the night sky that is a large, remote incandescent body like the sun5) the brightness of a celestial object as it would be seen at a standard distance of 10 parsecs6) a star that suddenly increases greatly in brightness because of an explosion that ejects most of its mass8) a small very dense star that is typically the size of a planet formed when a low-mass star has exhausted all its central nuclear fuel and lost its outer layers9) the brightness of a celestial object as it is actually measured from the earth10) a small rocky body orbiting the sun11) a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction13) a nuclear reaction in which atomic nuclei fuse to form a heavier nucleus with the release of energy14) a contracting mass of gas that represents an early stage in the formation of a star16) a unit of astronomical distance equivalent to the distance that light travels in one year, nearly 6 trillion miles17) when the position or direction of an object appears to differ when viewed from different positions22) a celestial object consisting of ice and dust and, when near the sun, a tail of gas and dust particles pointing away from the sun26) the classification of stars based on their spectral characteristics Across: 1) a massive and extremely remote celestial object, emitting exceptionally large amounts of energy, and typically having a starlike image in a telescope4) the theory that the universe originated sometime between 10 billion - 20 billion years ago from the explosion of a small volume of matter at extremely high density and temperature7) a celestial object of small radius and very high density, composed of closely packed neutrons thought to form by the gravitational collapse of a massive star after a supernova explosion, provided that the star isn’t big enough to produce a black hole12) a celestial object, thought to be a rapidly rotating star, that emits regular pulses of radio waves and other radiation at rates of up to one thousand pulses per second15) the range of wavelengths or frequencies over which electromagnetic radiation extends18) a cloud of gas and dust in outer space, visible in the night sky either as an bright patch or as a dark silhouette19) a small body moving in the solar system that would become a meteor if it entered the earth's atmosphere20) a system of two stars in which one star revolves around the other or both revolve around a common center21) a small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light23) a binary star whose brightness varies periodically as the two components pass one in front of the other24) The Hertzsprung–Russell diagram is a scatter graph of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their spectral types or classifications and effective temperatures25) an instrument used to detect radio emissions from the sky, whether from natural celestial objects or from artificial satellites27) a region of space having a gravitational field so intense that no matter or radiation can escape
 

 

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