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What you see here is an enormous cluster of about 3,000 stars called Westerlund 2. It gets its name from Swedish astronomer Bengt Westerlund, who discovered it in the 1960s. The cluster is located 20,000 light-years away from Earth.
KEYWORDS!
universe, galaxy, solar system, planet, star, telescope
wave, wavelength
amplitude, frequency, period, longitudinal, transverse, electromagnetic, absorption, reflection, refraction, diffraction, temperature, conduction, convection, radiation
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