Astronomy Blogs

Peruse our blogs and you’ll find editors and contributors to Sky & Telescope writing about everything from celestial events to astrophotography to upcoming space launches:

  • Explore the Night with Bob King – take a closer look at your night sky
  • Astronomy in Space with David Dickinson – find out what’s new in spaceflight, with an astronomy angle
  • Astrophotography with Jerry Lodriguss – learn tips and techniques for astro-imaging
  • Cosmic Relief by David Grinspoon – musings on life on other planets and our own

Linear vs. Stretched Images

When shooting with digital cameras, images will appear very dark and low-contrast. This is true with daytime photographs as well as long-exposure deep-sky images. That’s because raw data is linear. To make details visible, we must apply a non-linear transformation and s – t – r – e – t – c – h the…