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Liam's Astronomy Crossword

Across
A pulsar is a highly magnetized rotating neutron star that emits beams of electromagnetic radiation out of its *magnetic poles*. This radiation can be observed only when a beam of emission is pointing toward Earth, and is responsible for the pulsed appearance of emission.
a unit of distance used in astronomy, equal to about 3.26 light years (3.086 × 1013 kilometers). One parsec corresponds to the distance at which the mean radius of the earth's orbit subtends an angle of one second of arc.
The orbital eccentricity of an astronomical object is a dimensionless parameter that determines the amount by which its orbit around another body deviates from a perfect circle.
The Oort Cloud is an extended shell of icy objects that exist in the outermost reaches of the solar system. It is named after astronomer Jan Oort, who first theorised its existence. The Oort Cloud is roughly spherical, and is thought to be the origin of most of the long-period comets that have been observed.
the angle between the orbital plane of a planet, comet, etc. and the ecliptic, or between the orbital plane of a satellite and the equatorial plane of its primary.
Down
the point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun.
a unit of measurement equal to 149.6 million kilometers, the mean distance from the center of the earth to the center of the sun.
the point in the orbit of a planet, asteroid, or comet at which it is closest to the sun.
the angular distance of a point north or south of the celestial equator.
A nova (plural novae or novas) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star, that slowly fades over several weeks or many months. Causes of the dramatic appearance of a nova vary, depending on the circumstances of the two progenitor stars.