| A | B |
|---|
| What is electromagnetic radiation? | Energy that travels in the form of waves. |
| What is a spectrum? | a range of colors when each color has a different wavelength. |
| What are the colors of the visible light spectrum? | red, orange, yellow, green, blue, indigo, and violet |
| What are the waves of the electromagnetic spectrum? | radio waves, microwaves, infrared radiation, visible light, ultraviolet, x-rays, gamma rays |
| What happens to the wavelength that a star gives off, as it moves towards an object in space? | The wavelength gets shorter. |
| What happens to the wavelength that a star gives off, as it moves away from an object in space? | The wavelength gets longer. |
| What is red shifting? | When an object in space moves away from us, causing the wavelength to get longer |
| Which color of the visible light spectrum has the longest wavelength? | Red |
| Which color of the visible light spectrum has the shortest wavelength? | Violet |
| Which wave of the electromagnetic spectrum has the longest wavelength? | Radio Waves |
| Which wave of the electromagnetic spectrum has the shortest wavelength? | Gamma Rays |
| What characteristics are used to classify stars? | color, temperature, size, brightness, and chemical composition |
| How are the color and temperature of a star related to each other? | You can tell by the color of a star, the temperature of a star. The cool colors are red and red-orange. The hot colors are blue and blue-white. |
| What are the various sizes of stars? | neutron stars, dwarf stars, medium-sized stars, giant stars, and super-giant stars |
| How do astronomers determine the chemical compsition of stars? | Because each element gives off its own distinctive color, astronomers use a spectrograph. The distinctive color of the element will be present in the spectrograph if that element is present. |
| What does the brightness of a star depend on? | temperature and size |
| What is apparent brightness? | How bright a star appears to be from Earth |
| What is absolute brightness? | How bright a star is from a standard distance from Earth. |
