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- Active longitudes 1
- Active mass 1
- Active optical waveguides 1
- Active Optics 3
- Active optics technology 1
- Active or adaptive optics 1
- Active Orbitals 1
- Active Quasars 1
- active quasars 1
- Active Radio Galaxies 1
- Active Region 2
- Active region 2
- Active Region NOAA 8038 1
- Active Regions 1
- Active regions 9
- Active regions (ARs) 1
- Active solar corona 1
- Active Space Configuration 1
- Active sun 3
- active – galaxies 1