Astronomy, explained
The complete guide libraryStart with a question
Why does the Moon
change shape?
The Moon stays round. As it travels around Earth, we see different amounts of its sunlit half.
That changing view gives us the phases, from new moon to full moon and back. Earth's shadow causes a lunar eclipse, not the monthly phases.
See how all eight phases workReference: NASA's Moon phases guide
A closer look
- Are those colours real?
- What a nebula photograph records, and how its colour is made.
- What makes an aurora?
- Read about the light above the polar skies.
- Which star is that?
- Names, constellations and a starting point for looking up.
From understanding the sky to keeping a night
Your place.
Your moment.
A star map uses a location, date and time to plot the stars above the horizon. This is Greenwich at the start of 2026; yours can mark a night that matters to you.
Read what a star map shows Make a star map & see available formatsChoose your details and review the chart before ordering. Prices and available sizes are shown in the maker.
Astronomy on the wall
Keep looking.
If a subject catches your eye, explore its artwork next. Compare the picture, size and finish before choosing a print.
Explore nebula artworkCompare poster, frame and canvasBrowse the full collection
Artwork from the collection. See its product page for the subject, finish and sizes.
Have a photograph of your own?
Print your original image, or choose an AI style to change it first. You will confirm that you own it or have permission to use it.
Print the original photographTry an AI styleAI styling offers three watermarked previews per client per day after email verification. Review the separate results and choose the one you want before proceeding.