April 2025
- Focal Plane (26)
- One Good Target (31)
- Rick's Picks (32)
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Astronomy Fundamentals: A Look at the History of Alvan Clark Telescopes
In the 19th century, Alvan Graham Clark was one of the premier lens makers for telescopes. His craftsmanship was sought after and many observatories…
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The Cosmologist’s Puzzle: The Age and Expansion Rate of the Universe.
We are confused about how old the Universe is. Until recently, astronomers estimated that the Big Bang occurred between 12 and 14 billion years…
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Two Galaxies in Canes Venatici (M94 & NGC 4244)
April 2025 · With side trips to a colorful double star and a nearby subdwarf
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April ’25 – Rick’s Picks
All month: the solar system balances morning and evening targets this month as Mercury, Venus, Saturn, and Neptune move into the predawn sky, while…