Have you ever noticed that owls have big eyes? That’s because they live at night. During the dark, you need really big eyes to see

Did you ever try to count the stars in the sky? It’s almost impossible – there’s just too many of them! On a clear, dark

If your ears are good, you can hear very high tones. Children’s ears are usually better than the ears of grown-ups. So you might be

Since Hans Lipperhey built his first cheap telescope in his own workshop, telescopes became larger, and also more expensive. Sometimes, rich businessmen provided the money