Image: https://upload.wikimedia.org/wikipedia/commons/thumb/a/a7/ACT-CL_J0102%E2%88%924915.jpg/250px-ACT-CL_J0102%E2%88%924915.jpg


Image: https://upload.wikimedia.org/wikipedia/commons/7/73/B1957_ill1.jpg


Image: https://upload.wikimedia.org/wikipedia/commons/2/23/Orbits_of_Cruithne_and_Earth.gif


Image: https://cdn-images-1.medium.com/max/1600/0*h4PdFxwRp0s26Idv.jpg


Image: https://upload.wikimedia.org/wikipedia/commons/8/86/Smith%27s_Cloud_-_2008_-_Bill_Saxton%2C_NRAO%2C_AUI%2C_NSF.jpg


Image: http://en.es-static.us/upl/2015/02/milky-way-dark-matter-cp.jpg


Image: https://exoplanets.nasa.gov/system/news_items/main_images/107_heic1312a.jpg


Image: https://upload.wikimedia.org/wikipedia/commons/thumb/8/85/X-RayFlare-BlackHole-MilkyWay-20140105.jpg/400px-X-RayFlare-BlackHole-MilkyWay-20140105.jpg


Image: http://discovermagazine.com/~/media/Images/Web%20exclusives/2015/June/_R136a1.jpg?mw=738


Image: https://upload.wikimedia.org/wikipedia/commons/b/b2/Boomerang_nebula.jpg

المصادر:
هنا