NASA is releasing several images taken by the Hubble Space Telescope, which is the closest yet look at the red planet. Altogether there are four images, which show the entire planet. Each view shows the planet as it completes one quarter of its daily rotation. In these views the north polar cap is turned toward the Earth and is clearly visible at the top of each picture. The images, were taken in the middle of the Martian northern summer, when the polar cap was at its smallest size. During this season the sun shines continuously on the polar cap. Previous spacecraft observations have shown that this summertime polar cap is composed of water ice, just like Earth's polar caps.

  The Hubble Telescope pictures reveal that great changes have occurred on the surface of Mars in the past 20 years. The Martian surface is ever changing. Some regions that were dark 20 years ago are now bright red; some areas that were bright red are now dark. Winds move sand and dust from region to region, often in huge dust storms. Over long timescales many of the larger bright and dark markings remain stable, but smaller details come and go as they are covered and then uncovered by sand and dust.

How is the image of the north polar cap of Mars?

Guest: I'd like a room with an ocean view, please.

Clerk: I'm sorry. ______.

Customer: ______.

Waiter: I'm sorry. Didn't you order fried shrimp?

Customer: I ordered fried chicken.

Waiter: Oh, all I heard was fried shrimp. Let me have kitchen redo this for you.

Customer: I'm looking for a new living room set.

Salesman: We have a lot of very nice sets. What style. do you have in mind?

Customer: ______. What ! need is something comfortable.

Salesman: Good morning. Planning to buy a new car today?

Customer: ______.

Salesman: What kind of car are you looking for?

Customer: Something that has enough room for my family.

Tom: I see in the paper they're sending more equipment to space. And we might have to live there someday.

John: ______! I'm staying right here!

Alan: My schedule this afternoon is an absolute mess. Between 3: 30 and 4: 00 I'm supposed to be in four different places. There's no way.

Cindy: ______?

Rebecca: No, what happened?

Cindy: They let him go as he is suspected to be cheating.

Robert: What are you doing?

Ellen: Trying to get this wine stain out of the carpet.

Robert: Hang on. There's some soda in here. It should take the stain right out.

Ellen: Really? Hey, ______.

Clerk: Good morning. Can I help you?

Miss Chang: Yes, I'd like a one-way ticket to Manchester 8:15 tomorrow evening.

Clerk: Fifteen pounds, please.

Miss Chang: ______

Host: John, come and sit in the sofa. Dinner will be ready in a minute. Could I get you something to drink?

Guest: ______