The hottest (O and B type) stars are usually binary stars, while the coolest (M type) stars are usually single stars.

Name: The hottest (O and B type) stars are usually binary stars, while the coolest (M type) stars are usually single stars.
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O and B type stars are often found in binary systems due to their massive nature and formation processes, while M type stars are more common and often found as single stars.

The Hottest (O and B Type) Stars Are Usually Binary