2. ν max
So hνmax ≈ 2.82 kT or = 5.88x1010 Hz K −1
T
2900
Doing the same in wavelength units: λmax = µm
T

3. High Resolution Imaging from Space
QuickTime™ and a
TIFF (Uncompressed) decompressor
are needed to see this picture.

4. β Cyg = “Albireo”

12. An “optimistic” interpretation of the 21-cm data