Sinus Iridium on the Moon

Yesterday we mentioned that the Sun was at the exact angle to illuminate the Moon’s Jura Mountain Range. The effect is sometimes called the Golden Handle of the Moon because it resembles a small handle on the side. Since the sky was clear here in southwest Michigan last night, I took a picture of it. The tiny “handle” that you see is a semi-circular ridge surrounding a flat plain called the Sinus Iridium (Latin for the Bay of Rainbows). Sinus Iridium is actually an impact crater which has filled with lava, and the “mountains” that the Sun is illuminating is the edge of the crater.

In the NASA photo, you can see wave ripples on the surface as the lava flowed into the basin of the crater and hardened.

On our Does God Exist? educational tours of the Canyonlands we always visit Meteor Crater in Arizona. It is perhaps the best-preserved impact crater on Earth. At three-quarters of a mile (1.2 km) across, it is awe-inspiring to see. By comparison, the Sinus Iridium crater is 150 miles (240 km) across. You can also see several smaller impact craters that were formed after the lava flow.

As you examine the surface of the Moon, you will see that it is covered with impact craters caused by meteor and asteroid collisions. Earth has been bombarded with asteroids in the past. There is evidence of a large (93 mile, 150 km) impact crater called the Chicxulub Crater near what is today the Yucatan Peninsula.

Since Earth is a bigger target for impacts, why is Earth’s surface not pockmarked with craters like the Moon’ surface? Scientists have found evidence of about 190 impact craters on Earth. Most of them were early in Earth’s history, and erosion, plate tectonics, and other forces have hidden them from view. More importantly, we are protected from many of the impacts by our atmosphere. The heat from friction as a meteor enters the atmosphere at high speeds usually, but not always, causes them to burn up before they touch the ground. The more we see of God’s creation, the more we see His wisdom and power.

You can read more about impact craters and their effect on life on planet Earth in our previous posts by using these links. METEOR CRATER (also called the Barringer Crater) and the CHICXULUB CRATER. You can read about a Martian Meteorite HERE.

–Roland Earnst © 2019