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Icy Travelers
Comets are cosmic snowballs of frozen gases, rock and dust roughly the size of a small town. When a comet's orbit brings it close to the sun, it heats up and spews dust and gases into a giant glowing head larger than most planets. The dust and gases form a tail that stretches away from the sun for millions of kilometers.

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zenith

The point on the sky directly above the observer.

zodiacal light

a faint glow from light scattered off of interplanetary dust along the plane of the ecliptic.

 
Can't find it? Don't understand it? Ask us.
Q
zenith

The point on the sky directly above the observer.

zodiacal light

a faint glow from light scattered off of interplanetary dust along the plane of the ecliptic.