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Author Archives: siyuan2016
Image Source In the class, we talk about the measures to accelerate spacecraft and satellites that one day may make interstellar travel possible for humans in their lifetime. And in this blog I would like to introduce some other practical and hypothetical propulsion methods. The first method is a practical one called ion thruster, a […] Continue reading → Continue reading
image source The Leonids is a meteor shower associated with the comet Tempel-Tuttle. It gets its name from the location of its apparent radiant in the constellation Leo and has been famous for its most spectacular meteor storms since its identification in 1833. Since comet Tempel-Tuttle is a periodic comet with an orbital period of […] Continue reading → Continue reading
image source In the class, we learn about the astrometric technique, Doppler technique and direct imaging used to detect extrasolar planets. And in this blog, I’d like to introduce some other planet-hunting strategies that have proved to be applicable. The first method is called gravitational microlensing. A gravitational microlensing occurs only when two stars are […] Continue reading → Continue reading
Image Source Volcano activity is one of the most important factors that affect global climate change. Strong volcanic eruptions will release huge amounts of SO2 and sulfate aerosols that will strongly absorb solar radiation into the stratosphere, creating a global layer of sulfuric acid haze and cooling the Earth’s climate for more than 1 year. […] Continue reading → Continue reading
Image Source Since the discovery of nuclear fission and nuclear fusion, people have thought to use nuclear reactions that release energy to generate heat for industrial production. Up to 2015, nuclear power has provided more than 10% of world’s electricity. Since fusion involves the merging of atomic nuclei and it’s so hard to get it […] Continue reading → Continue reading
image source Throughout human history, the invention and improvement of telescope occupied an indispensable place in the advancement of astronomy. And this blog is devoted to introducing the history of telescope in last four hundred years. The earliest known workingtelescopewas created by Hans Lippersheyin 1608 to “see things far away as if they are nearby”. […] Continue reading → Continue reading
Galileo Galilei pic source Italian astronomer, physicist, engineer, philosopher, and mathematician Galileo Galilei ( 15 February 1564 – 8 January 1642) was an astronomer who played an major role in the scientific revolution during the Renaissance.He was called the “father of observational astronomy” and the “father of modern physics”.His contribution to astronomy includes his discovery of the […] Continue reading → Continue reading
Source:Solstice and equinox dates Astrology plays an important roles in ancient civilizations like Egypt ,Sumeria and China.Because their deep connections to agricultures and societies,solstices and equinoxes were celebrated by both nobles and civilians in China for over a thousand years.And this blog is intended to introduce some activities and customs popular on these four special days.On […] Continue reading → Continue reading
Source:Getty We talked about the size and scale of our universe in the class last week, and here I’d like to add some interesting facts and discoveries in this field.Though we have already had some approximations about universe’s age,nowadays it is still hard to estimate the exact size of the it. With the development of […] Continue reading → Continue reading