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A Muslim astronomer of the Islamic Golden Age charting the stars by candlelight with a brass astrolabe and celestial globe
Astronomers Astronomers
Famous Muslim Astronomers: 12 Pioneers Who Shaped the Sky
10 Min
Painterly banner of Al-Biruni, the medieval Persian astronomer, measuring a star chart with brass dividers by lamplight in his study
Astronomers Astronomers
Al-Biruni: The Medieval Genius Who Measured the Earth
Men in Astronomy
9 Min
Redshift concept diagram: a galaxy's spectral lines shifted toward the red end of the spectrum
Redshift and Blueshift: How Light Reveals an Expanding Universe
Space Science
11 Min
La Silla Observatory in Chile under a starry sky, a high, dry site with excellent astronomical seeing
Telescope Resolution and Astronomical Seeing: The Limits of Sharpness
Astrophotography Fundamentals Astrophotography
8 Min
A German equatorial telescope and camera rig used to capture calibration frames in astrophotography
Calibration Frames in Astrophotography: Darks, Flats & Bias Explained
Astrophotography Fundamentals Astrophotography
9 Min
Worm-and-wheel gearing that illustrates how telescope mount backlash occurs
Telescope Mount Backlash: How to Diagnose and Fix It
Astrophotography Fundamentals
10 Min
Astronomical units of measurement shown as a ladder of methods for measuring cosmic distances
Astronomical Units of Measurement: How We Measure the Universe
Space Science
12 Min
Galaxy types across the Hubble Ultra Deep Field, from spirals to ellipticals
galaxies galaxies
Galaxy Types: A Stargazer's Guide to the Shapes in the Sky
11 Min
Where is Voyager 1 now — the NASA Voyager spacecraft in interstellar space
Spacecrafts Spacecrafts
Where Is Voyager 1 Now? Its Current Distance, Speed & Status
Space Exploration
9 Min
Telescope rig tracking the night sky during an autoguiding imaging session
Autoguiding Explained: How to Get Round Stars on Long Exposures
Astrophotography Fundamentals
8 Min
Bahtinov mask used for astrophotography focusing
Astrophotography Focusing: A Beginner's Guide to Sharp Stars
Astrophotography Fundamentals
8 Min
Long-exposure photograph of star trails circling the north celestial pole
Polar Alignment for Astrophotography: A Beginner's Guide
Astrophotography Fundamentals
9 Min