Across
- 1. Arrangement of light in order of increasing wavelength
- 3. Nearby stars appear to change positions in the sky because we are observing them from different perspectives (2 words)
- 5. Device that separates the light into different wavelengths
- 7. astronomers were able to first calculate the mass of stars in ___________ systems.
- 8. Stars have ____________ spectra.
- 9. Stars that fuse hydrogen to helium in their core plot in the ________ _________ field of the H-R diagram.
Down
- 1. Different _________ ________ are distinguishable based on absorption lines,in turn controlled by the temperature of the star
- 2. Distances to stars are expressed in this unit
- 4. Form by relaxation of electrons in a hot, low-density gas cloud, from high to low energy levels (2 words)
- 6. Inversely proportional to temperature (2 words, first one Greek)
- 7. Dense object, perfect absorber and emitter of light. Its spectrum is completely controlled by its temperature
- 10. A unit used to measure a very tiny angle