On last question regarding a sci-fi title

I’m flushed with giddiness–you guys are good! So good, that I’m ready to take one last shot here.

Please direct me to the author or title of this short story:

There’s this race of creatures (I don’t know if they’re human, though they are humanoid) that live on a planet that’s almost constantly blasted with hard radiation emitted by the local sun. The humanoids must live in a cave, because to venture outside would mean death within seconds due to the aforementioned solar radiation. However, the cave doesn’t offer 100% protection and the amount of radiation that does get through results in a severe acceleration of the aging process. The average lifespan is something like two weeks!

Much of the two week lifespan is spent getting up to speed–passing on the knowledge that has been accumulated. Obviously, very little time is left over discovering “new” things and as more knowledge is accumulated, more time must be spent each successive generation in simply passing it on.

As the story progresses, we learn that the creatures ended up on this planet as a result of a spaceship crash. The spaceship lies among the hills opposite the cave and separated by a valley. One humanoid sees reaching the spaceship as the solution to escaping this wasteland of a planet, but how to get there? The sun only sets for a matter of minutes each day. The humanoid has only one week to work out how to make a mad dash to the spaceship which may offer rescue.

Does this ring a bell? Anyone?

Can’t remember the name of the story, but I believe it’s from R is for Rocket by Ray Bradbury.

I second the nomination for Ray Bradbury.

You guys are the greatest!
Many, many sincere thanks.

Yep, it’s Bradbury all right. Is it All Summer in a Day?

No, SK, isn’t that the one about life for children on Venus, where it rains all the time, except for the one day every something years when the sun comes out?

Yep. I remember that one, too. It was worth a try.

Frost and Fermi, I think, by Ray Bradbury.

Nope, it’s Frost and Fire by Bradbury. Just found my copy of R is for Rocket.

I knew it was Bradbury. I’ll look it up and see if Derleth’s right.