Match the sentences in column a based on whether they describe radio waves, visible light waves, or both (column b). column a 1. they’re invisible. : they’re invisible. 2. they have colors. : they have colors. 3. they’re used to learn about dust and gas clouds. : they’re used to learn about dust and gas clouds. 4. they can travel in a vacuum. : they can travel in a vacuum. 5. they’re used to find the temperature of stars. : they’re used to find the temperature of stars. 6. they have energy. : they have energy.