Seeing seven colours in a rainbow is down to what we expect to see, not reality. In fact, there are many more colours in a rainbow, as our readers explain Around 1665, Isaac Newton performed ...
People online share magnificent pictures of rainbows that they took.
Many of us have seen rainbows in the sky once the sun starts shining again after a spell of rain. For us to see a rainbow, the conditions need to be just right. We need some water droplets in the air ...