Messier 3 (M3) is a large, bright globular star cluster in the constellation Canes Venatici, containing over 500,000 stars and notable for its high number of variable stars (over 274). Located about 34,000 light-years away, it's an ancient cluster, estimated to be around 11.4 billion years old, and is easily visible with binoculars under dark skies, making it a popular target for amateur astronomers.
Type: Globular Cluster (NGC 5272)
Location: Constellation Canes Venatici
Distance: ~34,000 light-years from Earth
Stars: Over 500,000
Age: ~11.4 billion years
Notable Feature: Contains at least 274 variable stars, which are used to measure distance.
Best Time: Spring, especially June.
Location: In the constellation Canes Venatici, near the bright star Arcturus.
Method: Find Arcturus in Boötes, then look towards the constellation Canes Venatici. M3 appears as a faint, fuzzy patch between Arcturus and the star Cor Caroli.
Visibility: Can be seen with binoculars or a small telescope, even with some light pollution.
Appearance: Looks like a fuzzy, round blob in smaller telescopes, but larger telescopes resolve it into individual stars. Image Credit ESA/Hubble & NASA, G. Piotto et al.
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