[fish hawk]

As Glenn Beck says: I'm no scientist but I am a thinker. Something is rotten on Mars. For one thing if it was a cave, If the sun was shining directly into it one would see the sides for a ways down. If the sun was to the right or left of it, one would see one side or the other for a distance inside.

Also the pictures of A and B, I detect a thin ridge or mountain on the right. If it had a round hilled top it would make the round shadow. The near craters have shadows on the same side as this one.

I believe it is a phony picture put on the web by Al Gore and in a week he will tell us that it is from the Global Warming on Earth.

[chimera]

For one thing if it was a cave, If the sun was shining directly into it one would see the sides for a ways down. If the sun was to the right or left of it, one would see one side or the other for a distance inside.

Not if there is significant overhang. You're thinking its more like a shaft than a hole in a large underground volume. Think about a small hole in a large hollow sphere or box. Light can get in, but if it's deep and large enough, not much will get out.