Figure 1 A panoramic image of the Milky Way
NASA
The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and Highers/Advanced Highers exam specifications.
The size of the Milky Way can be measured in light years. To work out its shape, astronomers study emission spectra, especially at infrared and microwave wavelengths, and use physics such as Wien’s law and the Doppler shift of spectral lines.
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