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- astronomy2
- heliophysics2
- optical X-ray system2
- Halley comet1
- Prognoz satellite1
- X-ray mirror system1
- X-ray radiation1
- X-rays1
- active regions1
- astrophysical experiments1
- charged particles1
- chromospherical flares1
- comets1
- coronographs1
- gamma-ray bursters1
- grazing incidence mirrors1
- interference-polarization filters1
- investigation1
- long-lasting X-ray emission1
- measurements1