Triangulum Galaxy (Messier 33 / NGC 598) also known as the Pinwheel Galaxy, is a spiral galaxy that lies 3 million light-years away in the constellation Triangulum. If the sky is clear, at night we could see it with the naked eye. The galaxy was first discovered by Giovanni Battista Hodierna in about the 17th century, but was first identified by Charles Messier in 1764.
Astronomers estimate the Triangulum galaxy has a diameter of about 50 thousand light-years away, and that's half the diameter of the Milky Way galaxy. Triangulum galaxy has a mass of about 10-40 billion solar masses.
Triangulum galaxies moving toward the Andromeda galaxy, the Andromeda galaxy while moving toward our galaxy (the Milky Way) with a speed of 24 km per second.
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