1 00:00:20,653 --> 00:00:22,288 VEGA, ALTAIR AND DENEB 2 00:00:22,389 --> 00:00:23,323 OH MY! 3 00:00:23,423 --> 00:00:25,091 JAMES: HEY THERE STAR GAZERS. 4 00:00:25,191 --> 00:00:28,762 I'M JAMES ALBURY, DIRECTOR OF THE KIKA SILVA PLA PLANETARIUM IN GAINESVILLE, FLORIDA. 5 00:00:28,862 --> 00:00:31,564 DEAN: AND, I'M DEAN REGAS, ASTRONOMER FOR THE CINCINNATI 6 00:00:31,664 --> 00:00:32,766 OBSERVATORY. 7 00:00:32,866 --> 00:00:35,535 WERE HERE TO HELP YOU FIND YOUR WAY AROUND THE SKY. 8 00:00:35,635 --> 00:00:38,605 THIS WEEK WE WANT YOU TO KICK BACK AND RELAX UNDER THE STARS 9 00:00:38,705 --> 00:00:41,141 JAMES: SUMMER OFFICIALLY BEGINS AT THE END OF THIS 10 00:00:41,241 --> 00:00:44,978 WEEK AND THOSE WARM EVENINGS ARE PERFECT FOR LYING IN THE GRASS AND 11 00:00:45,078 --> 00:00:46,246 LOOKING UP. 12 00:00:46,346 --> 00:00:47,881 DEAN: THE BRIGHTEST STARS OF THE SEASON ARE OVERHEAD. 13 00:00:47,981 --> 00:00:50,984 JAMES: THERE YOU'LL FIND A TRIANGLE OF THREE CELESTIAL 14 00:00:51,084 --> 00:00:56,289 DAZZLERS - THE STARS OF THE SUMMER TRIANGLE NAMED VEGA, ALTAIR, AND DENEB. 15 00:00:56,389 --> 00:00:59,959 DEAN: AS SUMMER BEGINS, LET'S TAKE A CLOSER LOOK. 16 00:01:00,060 --> 00:01:03,496 DEAN: OKAY WE HAVE OUR SKY SET UP FOR 11PM ANY NIGHT 17 00:01:03,596 --> 00:01:05,065 THIS WEEK FACING EAST. 18 00:01:05,165 --> 00:01:08,568 YOU'LL SEE 3 BRIGHT STARS THAT REALLY STAND OUT. 19 00:01:08,668 --> 00:01:09,602 ITS A TRIANGLE. 20 00:01:09,702 --> 00:01:10,670 ITS RISING IN SUMMER. 21 00:01:10,770 --> 00:01:12,939 SO I'D CALL THAT A SUMMER TRIANGLE. 22 00:01:13,039 --> 00:01:16,176 JAMES: LET'S FOCUS IN ON THOSE 3 STARS, AND FLY IN 23 00:01:16,276 --> 00:01:17,610 FOR A CLOSER LOOK. 24 00:01:17,710 --> 00:01:20,180 DEAN: NO MATTER IF YOU LIVE IN THE COUNTRY OR THE 25 00:01:20,280 --> 00:01:24,818 HEART OF A CITY, YOU SHOULD BE ABLE TO FIND THESE THREE STARS DISTINCTLY IN THE SKY. 26 00:01:24,918 --> 00:01:30,623 WHEN YOU CONNECT THEM WITH LINES THEY FORM A HUGE TRIANGLE OVER 30 DEGREES LONG AND 20 27 00:01:30,723 --> 00:01:31,758 DEGREES HIGH. 28 00:01:31,858 --> 00:01:33,660 JAMES: REMEMBER THE EASY WAY TO MEASURE DEGREES 29 00:01:33,760 --> 00:01:34,861 IN THE SKY? 30 00:01:34,961 --> 00:01:37,697 YOUR FIST AT ARMS LENGTH IS ABOUT 10 DEGREES. 31 00:01:37,797 --> 00:01:41,101 SO SEE IF YOUR SUMMER TRIANGLE IS TWO FISTS HIGH AND THREE 32 00:01:41,201 --> 00:01:42,335 FISTS LONG. 33 00:01:42,435 --> 00:01:44,304 DEAN: THE BRIGHTEST STAR OF THE THREE, AND THE ONE 34 00:01:44,404 --> 00:01:47,640 CLOSEST TO THE ZENITH JUST AFTER SUNSET IS CALLED VEGA. 35 00:01:47,740 --> 00:01:50,443 JAMES: DO I DETECT A SLIGHT BLUE-ISH TINT TO 36 00:01:50,543 --> 00:01:51,444 THIS STAR? 37 00:01:51,544 --> 00:01:52,946 DEAN: YOU SURE DO. 38 00:01:53,046 --> 00:01:56,950 VEGA IS A BLUE-WHITE GIANT STAR AND THIS TELLS US ITS TEMPERATURE. 39 00:01:57,050 --> 00:01:59,652 BLUE IS HOTTER THAN WHITE WHICH IS HOTTER THAN YELLOW. 40 00:01:59,752 --> 00:02:04,691 VEGA IS WELL OVER 16,800 DEGREES FAHRENHEIT ON ITS SURFACE. 41 00:02:04,791 --> 00:02:07,494 MUCH HOTTER THAN OUR 10,000 DEGREE YELLOW SUN. 42 00:02:07,594 --> 00:02:09,729 JAMES: THE SECOND BRIGHTEST STAR IN THE TRIANGLE, 43 00:02:09,829 --> 00:02:13,266 AND THE ONE OFF TO THE RIGHT, IS CALLED ALTAIR. 44 00:02:13,366 --> 00:02:17,770 ALTAIR IS STARK WHITE IN COLOR WITH A TEMPERATURE OF 13,400 DEGREE 45 00:02:17,871 --> 00:02:18,972 FAHRENHEIT. 46 00:02:19,072 --> 00:02:20,940 DEAN: AND THE FAINTEST OF THE THREE, OVER TO THE 47 00:02:21,040 --> 00:02:22,775 LEFT IS CALLED DENEB. 48 00:02:22,876 --> 00:02:26,779 DENEB IS BLUEISH-WHITE - NOT AS BLUE AS VEGA BUT HOTTER THAN ALTAIR. 49 00:02:26,880 --> 00:02:31,518 IT SCORCHES SPACE WITH A SURFACE TEMPERATURE OF ABOUT 14,800 DEGREES. 50 00:02:31,618 --> 00:02:35,255 JAMES: EACH BRIGHT STAR IN THE SUMMER TRIANGLE IS 51 00:02:35,355 --> 00:02:37,023 PART OF ITS OWN CONSTELLATION. 52 00:02:37,123 --> 00:02:41,494 IF I USE MY IMAGINATION (AND SOME HELP FROM THE STAR GAZERS GRAPHICS DEPARTMENT), 53 00:02:41,594 --> 00:02:43,863 I CAN JUST MAKE THEM OUT. 54 00:02:43,963 --> 00:02:46,766 VEGA IS PART OF THE CONSTELLATION LYRA THE HARP. 55 00:02:46,866 --> 00:02:50,003 THE STARS MAKE A TINY PARALLELOGRAM HANGING OFF VEGA. 56 00:02:50,103 --> 00:02:55,775 IN SOME PICTURES OF LYRA THERES A BIRD AROUND THE HARP - SINCE PEOPLE ALSO CALLED THIS A 57 00:02:55,875 --> 00:02:57,010 VULTURE. 58 00:02:57,110 --> 00:02:59,045 DEAN: ALTAIR IS THE EAGLE EYE OF THE CONSTELLATION 59 00:02:59,145 --> 00:03:00,380 AQUILA THE EAGLE. 60 00:03:00,480 --> 00:03:03,483 IF YOU CANT SEE AN EAGLE IN THOSE STARS, YOU'RE NOT ALONE. 61 00:03:03,583 --> 00:03:06,252 BUT AT LEAST YOU KNOW WHERE THE EYE IS. 62 00:03:06,352 --> 00:03:08,855 JAMES: AND DENEB IS THE TAIL STAR OF THE STELLAR 63 00:03:08,955 --> 00:03:11,324 SWAN - THE CONSTELLATION CYGNUS. 64 00:03:11,424 --> 00:03:16,029 OKAY, THAT'S AN EASY ONE TO PICTURE WITH HIS BODY AND LONG, STRETCHED-OUT BEAK. 65 00:03:16,129 --> 00:03:19,799 CYGNUS FORMS A CROSS SHAPE AND IS ALSO CALLED THE NORTHERN CROSS. 66 00:03:19,899 --> 00:03:22,235 DEAN: NOW LETS TALK DISTANCES. 67 00:03:22,335 --> 00:03:26,539 VEGA IS THE BRIGHTEST OF THE THREE STARS BUT IS NOT THE CLOSEST. 68 00:03:26,639 --> 00:03:30,743 THAT HONOR GOES TO ALTAIR WHO IS ONLY 17 LIGHT YEARS AWAY FROM US. 69 00:03:30,843 --> 00:03:35,481 WITH PROFESSIONAL TELESCOPES WE CAN ACTUALLY SEE THAT ALTAIR IS SPINNING RAPIDLY. 70 00:03:35,582 --> 00:03:39,919 IT SPINS SO FAST THAT IT HAS SQUISHED ITS SHAPE TO RESEMBLE A BLUE-WHITE EGG. 71 00:03:40,019 --> 00:03:42,522 JAMES: VEGA IS THE SECOND CLOSEST AT ABOUT 72 00:03:42,622 --> 00:03:44,924 25 LIGHT YEARS AWAY. 73 00:03:45,024 --> 00:03:48,595 THAT MEANS THE LIGHT THAT YOU SEE LEFT VEGA 25 YEARS AGO. 74 00:03:48,695 --> 00:03:50,430 THAT WAS BACK WHEN I HAD HAIR! 75 00:03:50,530 --> 00:03:52,298 DEAN: HA! 76 00:03:52,398 --> 00:03:55,868 DENEB IS NOT ONLY THE FARTHEST OF THE THREE, IT IS PERHAPS THE FARTHEST STAR YOU CAN SEE 77 00:03:55,969 --> 00:03:57,503 WITH THE NAKED EYE. 78 00:03:57,604 --> 00:04:02,208 AT A WHOPPING 3000 LIGHT YEARS AWAY, WE CAN STILL SEE IT AS A BRIGHT STAR. 79 00:04:02,308 --> 00:04:04,844 THAT MEANS DENEB MUST BE HUMONGOUS. 80 00:04:04,944 --> 00:04:09,115 HERE IS A SIDE-BY-SIDE COMPARISON OF THE THREE SUMMER TRIANGLE STARS 81 00:04:09,215 --> 00:04:10,250 JAMES: WOW-SERS! 82 00:04:10,350 --> 00:04:12,352 DENEB DWARFS THE OTHER TWO. 83 00:04:12,452 --> 00:04:15,788 DEAN: SO GET OUTSIDE UNDER THE SUMMER STARS THIS 84 00:04:15,888 --> 00:04:16,990 WEEK. 85 00:04:17,090 --> 00:04:18,725 JAMES: ENJOY THE WARM SUMMER NIGHTS AND LOOK FOR 86 00:04:18,825 --> 00:04:20,693 THE SUMMER TRIANGLE RISING IN THE EAST. 87 00:04:20,793 --> 00:04:23,630 DEAN: VEGA, ALTAIR AND DENEB SHINE IN THE SKY 88 00:04:23,730 --> 00:04:25,031 AS SUMMER BEGINS. 89 00:04:25,131 --> 00:04:26,032 SO DEFINITELY 90 00:04:26,132 --> 00:04:30,132 BOTH: KEEP LOOKING UP!