alien planets amp eyeball earths: the search for habitable planets
Bookmarked 666 weeks ago
watch this and other space videos at http:spaceripcomfind out in 1080p where to look for extraterrestrial life what planets are likely to have the right conditions and what makes earth special so far in this age of planet hunting we039ve yet to find anything like our solar system with rocky inner planets in neat circular orbits and evenly spaced gas giants on the periphery instead astronomers have glimpsed a diverse planetary zoo with giant planets in wide orbits around their parent stars others that swing in so close they leave a comet-like tail or molten rocky worlds emblazoned with oceans of lava these finds have added new complexity to theories of how solar systems emerge in the birth of a star as dust and gas swirl into the newborn star they form a proto-planetary disk within this frisbee-like structure gravity sculpts planetary bodies that grow in size sweeping up smaller bodies that form around them current theory holds that giant planets forming on the periphery commonly migrate into the inner solar system this confirms the observation of so-called hot jupiters orbiting perilously close to their parent stars but these giants may clear out smaller rocky planets that form close to the star creating a planetary desert just where you039d hope to find life does that make the search for another earth a wild goose chase to find out a group of planet hunters using the keck telescope in hawaii examined a sample of 166 sun-like stars within 80 light years of earthto their surprise they found that as many as a quarter of all sun-like stars should have planets roughly the size of earth now enter the kepler space telescope launched in march 2009 on a mission to find earth-like planets over a four-month period in 2009 it observed the light of over 150000 stars within 3000 light years of earth the data showed that at least in one case the planetary desert is not so barren the star kepler 11 is a yellow dwarf similar to our sun it has at least five planets close enough to be inside the orbit of our mercury with a sixth inside the orbit of venus there may well be additional planets further out that won039t be known until 2012 when data from longer orbits is completeoverall kepler turned up 58 planets in the so-called habitable zone most are large gas planets but who039s to say that some of them don039t have moons with liquid water think avatar pandorawith a growing planetary database astronomers are beginning to redefine what it takes to spawn life as we know it ideally astronomers will one day stumble upon a world about the size of earth with oceans an atmosphere a moon to stabilize its orbit a robust magnetic field to shelter it from solar winds and creatures beaming television shows into space that reveal their presence until then the most fertile ground for finding life turns out to be a long-overlooked class of stars m stars or red dwarfs range from one half to one-twentieth the mass of our sun and make up 76 of all the stars in our galaxy the most famous is in the southern constellation of libra just 20 light years away called gliese 581 a team of french and swiss astronomers had been studying its light from a telescope in the mountains of chile they noticed a slight jitter: the gravitational tugging of planets from this so-called radial velocity they deduced the presence of gliese 581b a planet with sixteen times the mass of earth at a distance of only six million kilometers it039s bound to be very hot then came planet c with an orbit of 11 million kilometers still too hot then there039s d at about 33 million kilometers from its sun at the outer edge of the star039s habitable zone it receives only 30 of the light that earth gets from our sun compare it to mars where surface temperatures average around --59 degrees celsius astronomers suspect that planet d is an icy world that migrated in from the outer solar systemred dwarfs are known as quotflare starsquot for the violent eruptions that take place on their surfaces in 1985 the red dwarf ad leo erupted with a thousand times more power than the worst solar eruptions to find out what that would do to a planet in a close orbit scientists simulated the blastthey found that ultraviolet radiation from the star would split oxygen molecules in the planet039s atmosphere forming ozone that039s could be enough to shield it from harm studies like this are prompting scientists to redefine just what they mean by quothabitable zonequot

ferrari sf15-t 2015 formula 1 revealed
Bookmarked 553 weeks ago
the ferrari sf15-t the sixty first car built by ferrari specifically to take part in the formula 1 world championship it is the second car made by ferrari since the reintroduction of turbo engines in 2014 the first year of these new regulations was extremely challenging for the scuderia and the lessons learned have been applied vigorously to the sf15-t to create a car that is in every respect a large step forwards with respect to the f14-tchassis: the most striking visual difference between the sf15-t and its predecessor is the lowering of the front end of the car in accordance with the change of regulations for the 2015 season after a few seasons of rather unappealing aesthetics the 2015 rules permit the sf15-t an attractive nose shape which also brings excellent aerodynamic performance aside from the nose area the regulations for 2015 are largely unchanged this has given the team a stable base on which to engineer a much stronger chassis than the year before:a casual glance at the back of the car reveals a much more tightly packaged rear end which allows more downforce to be extracted from the critical surfaces around the rear of the car the rear wing family has been extensively redesigned to deliver stable performance in corners while producing a larger drs effect on the straights the front and rear brake ducts have been remodeled to produce more cooling of caliper and brake disk while generating more downforce than their 2014 counterparts both front and rear suspension kinematics have been overhauled to present the tyre to the road in a manner that allows better use of the pirelli rubberintegration: as in 2014 the current rules place heavy emphasis on the strong integration of power unit and chassis integration is not just about packaging finding neat homes for all the myriad equipment in the car it is more about making sure that the pu and chassis are specified so that the resulting vehicle will have the highest possible performance a range of carefully chosen design targets ensure that the sf15-t has optimum choice of cooling to provide the best overall downforce and power levels in addition to carefully designed internal airflow the sf15-t has a much improved cooler matrix layout that allows several tenths of a second per lap compared to the previous yearbrakes: 2014 was the first year of the so called brake by-wire bbw a system permitted by the rules as a way of allowing the maximum amount of electric power to be harvested under braking while maintaining an optimal brake balance in practice it proved much easier to obtain the former than the latter with the first versions of this system the bbw was improved greatly during the 2014 season and the sf15-t is further optimized to produce a braking response that should allow the driver sensitive control while braking at the limittransmissionthe broadly stable regulations for 2015 have allowed us to work on the details of our transmission carrying forward lessons learned in 2014 to make sure that the sf15-t is a step forward in all areas the choice of 8 forward gear ratios are fixed for the entire season once they are run in the first race and our experience from last year has allowed us to choose these ratios carefully for best use over the course of the season the clutch traditionally a strong point for the scuderia has been further improved with a series of detailed changes to make sure that the sf15-t will continue to enjoy strong performance off the start lineweight and tyres: the regulations allow the weight of the car to increase by 11kg with respect to the 2014 car the sf15-t uses this extra allowance in the regulations to buy some additional performance features under the skin of the car while retaining a workable level of ballast to trim the centre of gravity of the carthe 2015 tyres are little changed from 2014 a new rear casing tested by all the teams towards the end of last year delivers better rear end grip especially while loaded in combined conditions of cornering and traction the range of compounds for the season and the selection of compounds taken to each circuit will be very similar to 2014 however the performance level of the sf15-t will be much higher than the f14t and should allow us to exploit all the performance available in the rubbermore videos visit our youtube channel http:wwwyoutubecomusersportscaronvideohttp:wwwsportscaronvideocomyou can also follow us on:facebookhttp:wwwfacebookcomsportscaronvideotwitterhttp:twittercomsportscarvideogooglehttp:plusgooglecomsportscaronvideopinteresthttp:pinterestcomsportscarvideo