Galle (Martian crater)

Galle is a big hole on the planet Mars that was made a long time ago when something hit the surface really hard. This impact made a bowl-shaped hole on the surface of Mars, just like when you press down on dough to make a dent in it. Galle is pretty big, about 230 kilometers (about 143 miles) across, and it is named after Johann Gottfried Galle, a famous astronomer from Germany. People like to study Galle and other craters to learn more about how Mars and other planets were formed, and to see if there is anything interesting inside them, like minerals or signs of past life.