Astro Glossary

  • Modern Astronomy

  • Monoceros, the Unicorn

    This faint constellation, to the east of Orion, contains some beautiful and prominent deep-sky objects, such as the Rosette Nebula and the Cone Nebula. It was created in the early 17th century to fill a void between brighter constellations.

  • Monte Alban

    An ancient Mexican city that housed a temple used for astronomical observations. The temple was built more than 2,000 years ago, and some of its structures align with the point on the horizon where Capella made its first dawn appearance. That appearance happened on one of the two days of the year when the Sun passed directly overhead — dates that were vital to the city’s ritual life. So Capella might have acted like a warning flag, alerting the city’s leaders that the time for the year’s most important ceremonies was at hand.

  • Morning Star

    A name for the planet Venus when it appears in the morning sky. Venus is the brightest object in the night sky after the Moon.

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