Understanding Telescope Magnification
Learn how focal length, eyepieces, aperture, and atmospheric seeing determine useful magnification.
Night sky • Telescopes • Space
Astronomy
Explore the night sky, learn how telescopes work, and turn observation into discovery.
Why the Moon Changes Shape
The Moon does not make its own light. Its changing appearance is geometry we can observe.
Your First Night With a Telescope
A practical first observing session: setup, focus, the Moon, and what to try next.