Journey to the Center of the Galaxy . ... Astronomers already know of some of the bizarre objects that exist at our Galactic center , including like vast cosmic dust clouds , bright star clusters , swirling rings of gas , and even a supermassive black hole . Much of the Galactic Center is shielded from our view in visible light by the intervening dust and gas, but it can be explored using other forms of electromagnetic radiation . ... Poll: When I couldn't find APOD online I thought that . ...