Isaac Newton loved experiments. During an experiment with prisms, he discovered that a rainbow had several colors in it (red, orange, yellow, green, blue, indigo, and violet). Since these are the only ...

The Milky Way galaxy, home to our solar system, is a vast structure. It contains billions of stars and a supermassive black hole. The galaxy is constantly rotating and growing by absorbing smaller ...

In 2024, June 20 marks the summer solstice, the first official day of astronomical summer. “Solstice” means the sun has gotten as high in the sky as it’s going to get for the year; on ...

The Moon’s illumination is given at 12 P.M. local time from the same location. For a look ahead at more upcoming sky events, check out our full Sky This Week column.