Across
- 5. stars (composed of neutrons) are thought to form by the gravitational collapse of the remnant of a massive star after a supernova explosion, provided that the star is insufficiently massive to produce a black hole.
- 6. is a distinct body of interstellar clouds
- 8. a celestial object, thought to be a rapidly rotating neutron star, that emits regular pulses of radio waves and other electromagnetic radiation at rates of up to one thousand pulses per second.
- 10. unit (symbol: au, or AU or AU) is a unit of length, roughly the distance from Earth to the Sun
- 11. the intrinsic brightness of a celestial object (as distinct from its apparent brightness diminished by distance)
- 13. regular, repeating path that one object takes around another object or center of gravity.
- 14. a squashed circle with two focus points or foci, planets orbit in an elliptical path oval
Down
- 1. is the distance light travels in one year.
- 2. the magnitude (brightness) of a celestial object as it would be seen at a standard distance of 10 parsecs.
- 3. a variable star having a regular cycle of brightness with a frequency related to its luminosity, so allowing estimation of its distance from the earth.
- 4. a contracting mass of gas which represents an early stage in the formation of a star, before nucleosynthesis has begun.
- 7. the magnitude of a celestial object as it is actually measured from the earth
- 9. stars a system of two stars in which one star revolves around the other or both revolve around a common center.
- 12. of intense interest to astronomers who use the information about the shift in frequency of electromagnetic waves produced by moving stars in our galaxy and beyond in order to derive information about those stars and galaxies. (redshift, blueshift)