China launched a new communication satellite using a Long March - 3B carrier rocket. It was named as;

The Food and Drug Administration (FDA), United States has approved first vaccine named Dengvaxia for the prevention of dengue disease but with certain conditions that use dengue vaccine only in people who have a previous history of the disease. The vaccine is also known as CYD-TDV and made by company Sanofi Pasteur. The vaccine is a live, attenuated dengue virus. Under the vaccination, 3 doses will be provided to the patient and after 1st dose there will be a difference of 6 months between 1st dose and 2nd dose and also a difference of 6 months between 2nd dose and 3rd dose.

NASA's OSIRIS-REx spacecraft broke a record after successfully entering into orbit around the asteroid Bennu - the smallest cosmic object ever to be orbited by a spacecraft. NASA's OSIRIS-REx spacecraft, 110 million kilometers away, carried out a single, eight-second burn of its thrusters. The manoeuvre placed the spacecraft into orbit around the asteroid Bennu. The spacecraft will circle Bennu about 1.75 kilometres from its centre, closer than any other spacecraft has come to its celestial object of study.

NASA's Anne McClain and Nick Hague took a spacewalk on 22nd March to replace ageing batteries on the International Space Station. Two American astronauts worked for several hours to swap three nickel-hydrogen batteries with more powerful lithium-ion ones. The duo overcame minor struggles in their first task, which involved attaching a tool bag on one of the station's trusses for possible future use. The space station uses solar panels to generate power but the batteries are used when it is in the dark and not getting power from the sun.

Scientists from Ulsan National Institute of Science and Technology (UNIST) in South Korea have developed a system that can produce electricity and hydrogen fuel from carbon dioxide. The Hybrid Na-CO2 system can continuously produce electrical energy and hydrogen through efficient carbon dioxide (CO2) conversion with stable operation for over 1,000 hours. The key to this technology is the easy conversion of chemically stable CO2 molecules to other materials. Much of human CO2 emissions are absorbed by the ocean and turned into acidity. The researchers focused on this phenomenon and came up with the idea of melting CO2 into water to induce an electrochemical reaction.If acidity increases, the number of protons increases, which in turn increases the power to attract electrons. If a battery system is created based on this phenomenon, electricity can be produced by removing CO2. In particular, this system has shown stability to the point of operating for more than 1,000 hours without damage to electrodes. The system can be applied to remove CO2 by inducing voluntary chemical reactions.

Indian Space Research Organization is planning to send a probe to study the sun early next year. ISRO chairman Dr K Sivan currently scientists are exploring possibilities to study more about Sun and the probe named Aditya-L1 will be sent to observe the solar corona, the outer layers of the Sun. The satellite would be ed in a halo orbit around the L1 (Lagrangian point A) of the Sun-Earth system so that it has the advantage of continuously viewing the Sun without any occultation or eclipses. The L1 is 1.5 million kms from t the mission to send Indian astronauts to space by 2022 is well on stream.

3 astronauts, Nick Hague and Christina Koch from US and Alexey Ovchinin from Russia arrived at the International Space Station (ISS) on Russian Soyuz spacecraft which was launched from Kazakhstan's Baikonur Cosmodrome on 14th March 2019. Soyuz spacecraft carries people and supplies to and from International Space Station and it has become the sole means of transportation after the retirement of Space Shuttle in 2011.

ISRO Chairman Dr. K Sivan has announced that the organization is well prepared to meet the targets of launching Gaganyaan manned mission to outer space by December 2021. Under Gaganyaan project, India is planning to send three astronauts to outer space for seven days and bring them back. 332 launches are planned this year. Important among them are Chandrayaaan -2 mission to the moon in mid-April. GSAT-20 Satellite for high bandwidth connectivity to be launched in September-October.

The Northrop Grumman Antares rocket and its unscrewed Cygnus Spacecraft launched which contains tons of NASA's supplies and 40 live mice to the International Space Station (ISS), from the Mid-Atlantic Regional Spacecraft at NASA's Wallops Flight Facility on Wallops Island in Virginia. The first stage of rocket was developed by the Ukrainian Yuzhnoye State Design Office. The mission named NG-11, is the 11th cargo flight for NASA by Northrop Grumman, to deliver 7600 lbs. (3,447 kg), the heaviest load for Cygnus till date which contains science gear and supplies to the sex person crew of the ISS. This mission will be the Northrop Grumman's longest one till date.

The Indian Space Research Organisation (ISRO) has recently launched Samwad with Students as part of its outreach programme. The Indian Space agency will engage youngsters across the country in activities concerning space science under this programme. The new conversation mission will inspire students cutting across schools and colleges. During the inauguration in Bengaluru, 40 students and 10 teachers from select schools interacted with ISRO Chairman Dr. K Sivan about the Indian Space Programme and their benefits to the common man.

Recently, Indian and the US navies conducted joint submarine hunting exercise near Diego Garcia in the Indian Ocean in which India's P8I Neptune Aircraft and US P-8A Poseidon maritime patrol aircraft along with the USS Spruance have participated. The objective of this exercise is to lay the groundwork for coordinating maritime patrol and reconnaissance.The Indian P-8I anti submarine aircraft which participated in the exercise is from Naval Air Squadron 312 based at Naval Station Rajali in Arakkonam, Tamil Nadu and US P-8A Poseidon aircraft which participated in the exercise is from Patrol Squadron VP-8 'Fighting Tigers', based in Jacksonville, Florida.