Your bike may soon be equipped with same tires used on Mars! The SMART Tire Company in California, US, is working with NASA scientists to adapt its space tire technology for bicycles. NASA has used the “nearly indestructible (坚不可摧的)” titanium (钛) tires to send rovers (探测车) to Mars and the moon. The tire is made from springs composed of (由……构成) lightweight nickel-titanium alloy (镍钛合金). By using this alloy, the bike tires will never need air or get flat, according to the firm.