Sci-Talks

Today January 17,2020 at 2:35 am(IST), ISRO (Indian Space Research Organisation) launched their first satellite of 2020 from French Guiana, by the European Arian-5 rocket.GSAT-30 take place the communication satellite INSAT-4A that complete their 15 years of service from 2005. GSAT-30 is 3,357kg heavy satellite that provide telecommunication service overall India and across the Asia and Australia. GSAT-30: ISRO's Communication Satellite credit : isro.gov.in GSAT-30 provide services for next 15 yeas.It will become ISRO's 24th satellite that launched by the Arian Rocket of ArianSpace which is a commercial arm of European Space Agency (ESA) . ESA is also a long term partner of satellite launching programs of India. ISRO planed more then 20 satellite launching in this year 2020,in which most waited Aditya L1 (ISRO's first mission to study the Sun), Chandrayaan 3 (3rd mission to study moon) and Gaganyaan (ISRO's 1st mission to carry Astronauts in Space). Desi

In a hot summer day we use lot of the cooling devices such as the electric fan, cooler, air conditioner (AC). all are consuming a large amount of electric energy and are become reason for increasing the electricity bills.these devices provide the instant cooling. but what happen if i says that we use such system that provide cooling for a long period of time at free of cost after its installation, you will says this is impossible  according to basic principle of thermodynamics the work done take place in removing heat from the body and this work done by the external electrical source by mean of the cooling devices.  so we need energy for cooling. but this is possible to remove heating from a body without doing some extra work on it by the virtue of the property that the heat energy is transferred from hotter body to colder body. removal of heat from atmosphere by this method called the passive radiative cooling.   before understing the radiative cooling process let understand how