. >>> astronaut chris hatfield is back on ter ra firm a. we have to get to know chris. pretty well but this chris is new. he is astronaut chris cassidy and he says luke is going to come to the space station and i need to fix myself up. he will show us how you can shave your head in space. >> go out on a limb here and get the full-on look. we have standard hair trimmer. the hair would go all over the place, so we need to connect it to our vacuum cleaner. >> it is so funny a guy is going through all of this to welcome another guy aboard the international space station. i guess little things like this make it fun. >> i think he learned to make a cool video and found an excuse to make a fool video. >> give yourself a space station mohawk. >> what do you think so far? stop here? i don't think so. >> this isn't to impress lucca. this is to kind of pay homage to lucca, so like you have a bald head, i will have a bald head to welcome awe barred. it is not like i want to look good. i want to say we're bros. >> astronaut bros, not that many people in it. >> the full on lucca read