Space scientists have collected a wealth of information from spacecraft that have orbited,landed on and dug into the Martian surface.

VOA: special.2010.07.28

They can develop as flat, discolored areas of skin or as raised growths, often with a rough surface.

VOA: special.2010.07.06

It is a small device that you move around on a flat surface in front of a computer.

VOA: special.2010.08.01

Embroidery work involves using colored yarn and a needle to create designs on the surface of cloth.

VOA: special.2009.11.04

The artist draws an image with oily ink onto a piece of stone or other flat surface.

VOA: special.2009.09.02

In it,he developed a theory that intelligent life had created waterways all over the surface of Mars.

VOA: special.2010.07.11

It shows two ducks that have just been shot by a hunter as they fly above the surface of a wide expanse of water.

VOA: special.2010.07.25

With such a vehicle, astronauts could explore a much larger area of the moon's surface.

VOA: special.2009.07.29

There also many different ways to change the appearance of the surface of a textile.

VOA: special.2009.11.04

A frieze is a long stretch of surface that has been painted or sculpted.

VOA: special.2010.01.27

The lunar lander,controlled by a computer, dropped toward the airless surface of the moon.

VOA: special.2009.07.15

Drop several seeds over the surface of the pot and cover with a thin layer of vermiculite, a substance that can hold air, water and nutrients.

VOA: special.2009.04.21

The designs and images on the surface of a tapestry are woven into the cloth as opposed to being only on the surface of the cloth.

VOA: special.2009.11.04

This would depend on the total surface area of roofs in a city.

VOA: special.2010.03.02