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PLEAIDES – REFLECTION NEBULAE IN AN OPEN CLUSTER. ORION – AN EMISSION NEBULA HII REGIONS. TAURUS-A, THE “CRAB” NEBULA A STRONG RADIO SOURCE – SYNCHROTRON RADIATION. CASSIOPEIA-A, A RADIO SOURCE. M13- A Globular Cluster. PLEAIDES – REFLECTION NEBULAE IN AN OPEN CLUSTER.
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