Planets are stationary
Planets rotate around the sun
Planets rotate around the earth
Planets are stationary, but stars rotate
He discovered a moon orbiting the planet earth.
He discovered moons orbiting the planet Jupiter.
He discovered other stars orbiting our solar system.
He discovered that the orbit of the planets is elliptical.
He discovered the planet Saturn.
He found a new comet circling earth.
He determined the shape of the galaxy.
He found planets in other solar systems.
Scientists mapped the orbits of nearby solar systems.
Scientists viewed light bending around a bowling ball.
Scientists charted the position of stars throughout a year.
Scientists took photos of stars before and during a solar eclipse.
A black hole
A distant galaxy
A nearby solar system
The universe is expanding rapidly
The universe has many galaxies close to ours.
The universe is composed of billions of galaxies.
The universe has background microwave radiation.
They can directly observe them with a telescope.
They monitor the pattern of movement and light from a star.
They chart the curvature of space as light bends around a star.
They predict the acceleration of nearby stars in relation to the planet.