Sunday, 13 January 2019

Space Craft


Space crafts, an orbital vehicle in the space for research, communication, transportation etc. Depending upon the purpose there are three types of space crafts classified as:
  • ·         Crewed space craft
  • ·         Space planes
  • ·         Unmanned space crafts

With constant progress in astronomy, Crewed Space Crafts is an important project all around the globe. On the occasion of Independence Day, our beloved Prime Minister announced our first Crewed mission by ISRO:  Gangayaan, India’s first manned Space Mission.
It started in 2006, which took couple of years to finalize the design. This will be a Crewed Space craft with 3 people on-board. The journey is planned for the duration for 7 days to reach the orbit and safely return to the Earth. While the testing is in process, it will have two test flights, in December 2020 and June 2022 respectively. The final crewed flight is expected to take off by December 2022, thus marking India the 4th Nation in the world to send crewed Space crafts after Russia, USA and China.
This 3.7 tons spacecraft having 16 minutes of liftoff time will be taking off from Sriharikota and will be into the orbit 300 to 400 Kilometer above the earth surface. Such an excitement!
Well sending a spacecraft isn’t everything about how to develop and launch. While sending a human force, there are different parameters that need to be taken care off like the environment control, life support, emergency escape etc. Different areas of engineering including aeronautics, mechanics, communication, information technology, thermal, electrical, etc. are involved marking a multi-functional project.

It includes Attitude Determination and Control for the altitudes control, the

Telemetry, tracking, and command (TT&C) used for communication between spacecraft and the ground systems.  Communication on board Spacecrafts takes place using radio antennas which is known as satellite communication while few spacecraft communicate using lasers. Also it has different Source for Power Generation and Propulsion for the thrust.
No wonder why rocket science is associated with the most difficult tasks around the world!
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Sunday, 6 January 2019

Merry-go-Round

And it completed yet another round…….


From the childhood we have seen the changing seasons teach us about the great phenomenon of the earth's revolution around the sun while constantly rotating around its own axis giving us day and night. We change our calendar according to the revolution of the earth. Thus we can see how these heavenly bodies affect our day to day lifestyles. This study is Astronomy.
365 days passed by and another year for the earth completed. How interesting it is that different planets on the same solar system have different lengths of year. Curiosity is on what is it dependent upon? Correctly guessed it’s the distance of the planet from the sun. Lesser the distance smaller is the year. So with the same logic, Mercury has the smallest year for 88 days while that of the dwarf planet Pluto is 248 earth years.
93 million miles away from the sun, Earth takes 365.25 days to circle all the way around the sun. That’s why a year is 365 days long! Hence the year is considered to be 365 days long adjusting the remaining 0.25 days in a leap year. (So leap year occurs every 4 years i.e.: 0.25*4).

Another fact related to the New Year is that as the clock strikes 12, Sirius- the brightest star celebrates its birthday by reaching the highest point in the sky. This is known as midnight culmination of Sirius.
Interestingly, just like we have an academic year and financial year, we have different types of calendars (precisely years) in our astronomy. Example, there are two types of calendars:
·         Solar
·         Lunar
Solar calendar depends only on the earth’s revolution around the sun while as the name suggests, lunar calendar changes according to moon's revolution which is in spiral orbit around the earth.

Isn’t it fun to see the stars in the sky while relaxing? So why just observe when you can learn further? We are here with all new courses with exciting information awaiting your presence. Stay tuned!!!
www.astronera.org