Subject
Astronomy-Observations.
16
Observations, Astronomical.
astrophysics
11
astronomy
9
Astrophysics.
7
History.
6
Astronomy.
5
telescope
4
Microwaves.
3
Optical engineering.
3
Physics.
3
history
3
optics
3
planet
3
Gravitation.
2
Planetary science.
2
cosmology
2
galaxy
2
high energy physics
2
solar system
2
star
2
Computer science-Mathematics.
1
Elementary particles (Physics).
1
Image processing.
1
Lasers.
1
Life Sciences.
1
Mars planet
1
Measurement.
1
Mechanics.
1
Meteorology.
1
Microscopy.
1
Photography.
1
Photonics.
1
Physical measurements.
1
Quantum field theory.
1
Signal processing.
1
Solar system.
1
Space sciences.
1
Spectroscopy.
1
Speech processing systems.
1
Technology-History.
1
antenna
1
biography
1
cosmic radiation
1
electrodynamics
1
elementary particle
1
instability
1
instrument
1
interferometry
1
magnetic field
1
more ...