_______ the distance light will travel in 1 year

_______ a system of bodies (planets, asteroids, comets, etc) that revolve around a star

_______ the star at the center of our solar system

_______ a huge grouping of billions of stars that often revolve around a center

_______ an instrument used to collect and magnify electromagnetic waves from desired points in the universe

_______ a massive collection of gases that releases tremendous amounts of electromagnetic energy due to nuclear reactions occurring within it

_______ an interstellar cloud of dust and gas that provides the birthplace for many stars

_______ energy waves sorted by different wavelengths into categories such as visible light, x-rays, gamma rays, infrared radiation, and radio waves