NEW YORK — Think the moon has many craters? New photos from the first spacecraft to orbit Mercury show the tiny inner planet has far more impressive battle scars from regular high-speed peltings by space rocks.

NASA’s Messenger spacecraft, which began orbiting the planet less than two weeks ago, reveals a pock-marked planet full of craters from pieces of asteroids and comets.

“Mercury has had an exposed surface for at least 3.5 to 4 billion years, and some of those surfaces are extremely cratered to the point where there are so many craters they start to obscure one another,” said mission chief scientist Sean Solomon.

He said it was surprising how many secondary craters there are. Those are craters created by the falling soil kicked up from space rock collisions. Those initial space rock crashes “throw out a lot of material in the explosive process,” Solomon said.

One area on the far north side of Mercury had never been seen by previous spacecraft on mere fly-bys. The new images show scatterings of secondary craters, almost like a loaded pizza, but not the primary crater that was first carved out. The region is also so far north that the sun barely gets above the horizon and casts long shadows.

Mercury is also darker and appears more weather-beaten than the moon, because of “the constant bombardment of the surface by dust particles and small meteoroids,” Solomon said.