Astronomy Magazine

The earliest test of Albert Einstein’s general theory of relativity took place just four years after he published it. During the May 29, 1919, total solar eclipse, British astronomer Sir Arthur Eddington and colleagues studied the theory by measuring how the Sun distorts light from background stars. According to general relativity, any object with mass

Katelyn Beecroft from London, Ontario, Canada On the morning of Oct. 6, 2026, the waning crescent Moon — then about 20 percent lit — occulted Jupiter as seen from much of eastern North America. This imager, tracking by hand with an 8-inch Dobsonian reflector, stacked the sharpest frames from video shot with a ZWO ASI224MC

Looking for a sky event this week? Check out our full Sky This Week column. November 5: Smoke out the Southern Cigar As fall gets into full swing, we are seeing less of the summertime stars. By 6 P.M. local time, the Summer Triangle — which flies high overhead on short summer nights — is now starting

Friday, November 6The waning Moon leaves us with perfect skies for deep-sky observing. Let’s kick off the week with a bright planetary nebula in Aquarius: NGC 7293, commonly known as the Helix Nebula.  Despite its impressive magnitude of 7.3, the Helix presents a challenge: It is a broad 13’ across, which spreads its light over

GS-100AR/AC High-Precision Guide Scope ToupTekHangzhou, China The GS-100AR/AC High-Precision Guide Scope is a guide scope, a wide-field imaging system, and a visual instrument. Its apochromatic design produces a flat 1-inch image circle and reduces purple fringing seen in earlier models. With a choice of rack-and-pinion or Crayford focusers, it offers flexibility for a range ...