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- Astronomy & Astrophysics32
- Physical Sciences & Mathematics32
- Astrophysics20
- Astronomy19
- Astronomical Observatories & Instruments18
- Instruments18
- Astronomical instruments17
- X-ray astronomy17
- Telescopes12
- Ultraviolet astronomy12
- Gamma ray astronomy10
- Nuclear astrophysics10
- Design and construction7
- Observations7
- Orbiting astronomical observatories7
- Data processing6
- Imaging systems in astronomy6
- Cosmology5
- Space astronomy5
- Automatic control4