A look back at the early years of Landsat. thumbnail: http://svs.gsfc.nasa.gov/vis/a010000/a011000/a011051/Landsat_ERTS_1973_Still_gal.png

STELLA: A DIY Handheld Scientific Instrument
If you are looking for a do-it-yourself (DIY) handheld spectrometer, you need to meet STELLA. STELLA (Science and Technology Education for Land/Life Assessment) is a portable scientific instrument developed by