Sun is white and not yellow, confirms former NASA astronaut!


Most people believe the Sun is yellow since it appears yellow from the ground, but after reading this tweet, we may have to rethink our views.

This space truth was recently confirmed by NASA astronaut Scott Kelly in a widely shared tweet. The Sun's true colour is actually white, and the explanation the dwarf star typically seems yellow is due to an odd interaction between light physics that causes the sun to look yellow the majority of the time.

Our atmosphere causes the sun to appear yellow. But once you are outside of the atmosphere of the Earth, the Sun appears to be all white. NASA claims that this is because of way our eyes see colour.

Sunsets and sunrises seem red, yellow, or orange because the sun's light must traverse through all of Earth's atmosphere to reach the surface when it is lower in the sky than when it is directly overhead.

According to NASA, shorter light wavelengths, like blue, are more likely to be scattered through the atmosphere as time goes on, whereas longer light wavelengths, like red, can go considerably farther.

Since the amount of sunshine merely inundates the photoreceptor cells in our eyes, blending all the colours together, we are unable to distinguish a single colour from the sun. White is the result of combining all colours of light. As a result, the sun appears white in space and yellow on Earth. DailyBangladesh/RAH, Source: https://www.daily-bangladesh.com/
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Mars rover sees hints of past life in latest rock samples

NASA's Perseverance Mars rover has detected its highest concentrations yet of organic molecules, in a potential signal of ancient microbes that scientists are eager to confirm when the rock samples are eventually brought to Earth.

While organic matter has been found on the Red Planet before, the new discovery is seen as especially promising because it came from an area where sediment and salts were deposited into a lake -- conditions where life could have arisen.

"It is very fair to say that these are going to be, these already are, the most valuable rock samples that have ever been collected," David Shuster, a Perseverance return sample scientist, told reporters during a briefing.

Organic molecules -- compounds made primarily of carbon that usually include hydrogen and oxygen, but also at times other elements -- are not always created by biological processes.

Further analysis and conclusions will have to wait for the Mars Sample Return mission -- a collaboration between NASA and the European Space Agency (ESA) to bring back the rocks that is set for 2033.

Nicknamed Percy, the rover landed on Mars' Jezero Crater in February 2021, tasked with caching samples that may contain signs of ancient life, as well as characterizing the planet's geology and past climate.

The delta it is exploring formed 3.5 billion years ago. The rover is currently there investigating sedimentary rocks, which came about from particles of various sizes settling in the then watery environment.

Percy cored two samples from a rock called "Wildcat Ridge," which is about three feet (one meter) wide, and on July 20 abraded some of its surface so it could be analyzed with an instrument called SHERLOC that uses ultraviolet light.

The results showed a class of organic molecules called aromatics, which play a key role in biochemistry.

"This is a treasure hunt for potential signs of life on another planet," NASA astrobiologist Sunanda Sharma said.

"Organic matter is a clue and we're getting stronger and stronger clues...I personally find these results so moving because it feels like we're in the right place, with the right tools, at a very pivotal moment."

There have been other tantalizing clues about the possibility of life on Mars before, including repeated detections of methane by Perseverance's predecessor, Curiosity.

While methane is a digestive byproduct of microbes here on Earth, it can also be generated by geothermal reactions where no biology is at play.DailyBangladesh/SA, Mars rover sees hints of past life in latest roc
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DRDO Celebrates 63rd Foundation Day; Chairman Reddy Calls To Focus On Cyber Security, Space, AI

New Delhi: The Defence Research & Development Organisation (DRDO) observed the 63rd Foundation Day of its establishment on Friday, 1st January 2021. G. Satheesh Reddy, Secretary DDR&D & Chairman DRDO met Defence Minister Rajnath Singh and presented him with a model of the Akash Missile System, which was recently cleared for export. On the occasion, the Chairman of DRDO along with DGs and Directors of DRDO HQ paid floral tributes to former President APJ Abdul Kalam at DRDO Bhawan, according to a press statement from the Ministry of Defence. The Ministry stated that DRDO was established in 1958 with just 10 laboratories to enhance the research work in the Defence sector and was tasked with designing and developing cutting-edge defence technologies for the Indian Armed Forces. The Defence Ministry stated that today, the DRDO is working in multiple cutting-edge military technology areas, which include aeronautics, armaments, combat vehicles, electronics, instrumentation, engineering systems, missiles, materials, naval systems, advanced computing, simulation, cyber, life sciences, and other technologies for defence. Addressing the DRDO fraternity, the DRDO Chairman Reddy extended warm wishes to DRDO employees and their families. He stated that an eventful year has passed and a new one is about to begin, and asked scientists to innovate and create for the nation. He said that efforts of DRDO have given a quantum jump to India’s self reliance in defence, contributing towards Atmanirbhar Bharat. He declared ‘Export’ as the theme of DRDO for 2021 and mentioned that many products based on DRDO technologies have already been exported by DPSUs and industry. He said that in 2020, the DRDO achieved many milestones such as the maiden landing of LCA Navy onboard INS Vikramaditya, demonstration of Hypersonic Technology Demonstration Vehicle (HSTDV), Quantum Key Distribution (QKD) & QRNG developments in the area of Quantum Technology, Laser Guided Anti Tank Guided Missile (ATGM), Supersonic Missile Assisted Release of Torpedo (SMART), Anti Radiation Missile (NGARM), enhanced version of PINAKA Rocket System, Quick Reaction Surface to Air Missile (QRSAM), Maiden launch of MRSAM, 5.56 x 30 mm Joint Venture Protective Carbine (JVPC), and many other milestones. He highlighted the contributions of DRDO during the Covid-19 pandemic and said that nearly 40 DRDO laboratories developed more than 50 technologies and over 100 products on a war footing for combating the Novel Coronavirus pandemic in India. These included PPE kits, sanitizers, masks, UV-based disinfection systems, Germi Klean, and critical parts of ventilators leading to ventilator manufacturing in the country in a very short span of time. He further said that DRDO has established three dedicated Covid hospitals at Delhi, Patna, and Muzaffarpur in a record time for strengthening the medical infrastructure. In addition, Mobile Virology Research and Diagnostics Laboratory (MVRDL) were developed to speed-up the Covid-19 screening and R&D activities at various locations for strengthening the Covid testing capabilities. The DRDO Chairman mentioned that new policies and procedures were launched for increasing the efficiency and ease of engagement with various stakeholders in the development, saying DRDO has also taken major steps for further strengthening its base for taking up technological challenges for the defence systems development and will continue to strive for the best in defence technology and ensure the system development in the shortest time. While congratulating DRDO scientists and all other personnel who worked in close coordination with the armed forces for user trials, he set many targets for them. He talked about the flagship programmes of DRDO such as Hypersonic Cruise Missile, Advanced Medium Combat Aircraft (AMCA), New Generation MBT, Unmanned Combat Aerial Vehicle, Enhanced AEW&CS, LCA MK II, and many other systems. In his speech, Chairman Reddy called upon DRDO scientists to focus on next generation needs including cyber security, space and, artificial intelligence. The immense potential available in DRDO has been a catalyst for the development of industries in defence manufacturing sector, he said, as per the Defence Ministry statement. The Chairman highlighted that the academic institutes, R&D organisations and industry need to work together on the advanced and futuristic technologies to make India self-reliant in defence sector. He mentioned that a number of SMEs and MSMEs are supplying small components to subsystems for all DRDO projects and have been nurtured by DRDO. Now they have become partners in all new developments. He stated that DRDO conducted a competition called ‘Dare to Dream’ for startups and very enthusiastic response have been received. He further added that at least 30 startups should be supported every year to develop innovative products for the armed forces. He said that DRDO should make efforts towards strengthening long term ties with academia and aim to leverage the academic expertise available in the country and increase the synergy with them, remarking that DRDO should concentrate on applied research and translational research and then make prototypes from the applied research. He further said that the industry should be in a position to adopt these technologies and have necessary infrastructure, and scale these up to market with sustained quality. He underlined the need to focus on documentation and production for faster induction, and said that many new initiatives towards enabling the industry and empowering youth for Defence R&D will be taken by DRDO.DRDO Chairman Reddy also launched an Online Industry Partner Registration Module to simplify the process of vendor registration. He released the DRDO Monograph on ‘Issues on Development of Communication Technology using Orbiting Satellites’ and also the Environmental Safety Manual and Guidelines for Disposal of Life Expired Chemicals and Gases at DRDO Laboratories. Source: https://indusdictum.com/

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Apollo 11 astronaut Michael Collins dies at 90

American astronaut Michael Collins, who flew the Apollo 11 command module while his crewmates became the first people to land on the Moon in 1969, died on Wednesday after battling cancer, his family said.

“Mike always faced the challenges of life with grace and humility, and faced this, his final challenge, in the same way,” Collins’ family tweeted on his official Twitter account.

Often described as the "forgotten" third astronaut on the historic mission, Collins remained alone for more than 21 hours until his two colleagues returned in the lunar module. He lost contact with mission control in Houston each time the spacecraft circled the dark side of the moon.

"Not since Adam has any human known such solitude as Mike Collins," the mission log said, referring to the biblical figure.

Collins wrote an account of his experiences in his 1974 autobiography, "Carrying the Fire," but largely shunned publicity."I know that I would be a liar or a fool if I said that I have the best of the three Apollo 11 seats, but I can say with truth and equanimity that I am perfectly satisfied with the one I have," Collins said in comments released by NASA in 2009. Source: https://www.daily-bangladesh.com/
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SpaceX Crew Dragon “Resilience” docks with ISS

A SpaceX Crew Dragon carrying four astronauts docked with the International Space Station Monday, the first of what NASA hopes will be many routine missions ending US reliance on Russian rockets.

“Dragon SpaceX, soft capture confirmed,” said an announcer as the capsule completed its 27.5 hour journey at 11:01 pm (0401 GMT Tuesday), with the second part of the procedure, “hard capture,” occurring a few minutes later.

The spacecraft, named “Resilience,” docked autonomously with the space station some 260 miles (400 kilometers) above the Midwestern US state of Ohio.

The crew is comprised of three Americans — Michael Hopkins, Victor Glover and Shannon Walker — and Japan’s Soichi Noguchi.

Earlier, mission commander Hopkins gave pilot Glover his “gold pin,” a NASA tradition when an astronaut first crosses the 100-kilometer Karman line marking the official boundary of space.

Glover is the first Black astronaut to make an extended stay at the ISS, while Noguchi is the first non-American to fly to orbit on a private spaceship.

The crew joins two Russians and one American aboard the station, and will stay for six months.

Along the way, there was a problem with the cabin temperature control system, but it was quickly solved.

SpaceX briefly transmitted live images from inside the capsule showing the astronauts in their seats, something neither the Russians nor the Americans had done before.

US President-elect Joe Biden hailed the launch on Twitter as a “testament to the power of science and what we can accomplish by harnessing our innovation, ingenuity, and determination,” while President Donald Trump called it “great.”

Vice President Mike Pence, who attended the launch with his wife Karen, called it a “new era in human space exploration in America.”

The Crew Dragon capsule earlier this week became the first spacecraft to be certified by NASA since the Space Shuttle nearly 40 years ago. Its launch vehicle is a reusable SpaceX Falcon 9 rocket.

At the end of its missions, the Crew Dragon deploys parachutes and then splashes down in water, just as in the Apollo era.

SpaceX is scheduled to launch two more crewed flights for NASA in 2021, including one in the spring, and four cargo refueling missions over the next 15 months.

NASA turned to SpaceX and Boeing after shuttering the checkered Space Shuttle program in 2011, which failed in its main objectives of making space travel affordable and safe.

The agency will have spent more than $8 billion on the Commercial Crew program by 2024, with the hope that the private sector can take care of NASA’s needs in “low Earth orbit” so it is freed up to focus on return missions to the Moon and then on to Mars.

SpaceX, founded by Elon Musk in 2002, leapfrogged its much older rival Boeing, whose program floundered after a failed test of its uncrewed Starliner last year.

– Russians unimpressed –

But SpaceX’s success won’t mean the US will stop hitching rides with Russia altogether, said NASA administrator Jim Bridenstine. The goal is to have an “exchange of seats” between American astronauts and Russian cosmonauts.

Bridenstine also explained it was necessary in case either program was down for a period of time.

The reality, however, is that space ties between the US and Russia — one of the few bright spots in their bilateral relations — have frayed in recent years.

Russia has said it won’t be a partner in the Artemis program to return to the Moon in 2024, claiming the NASA-led mission is too US-centric.

Dmitry Rogozin, the head of Russia’s space agency, has also repeatedly mocked SpaceX’s technology, telling a state news agency he was unimpressed with the Crew Dragon’s “rather rough” water landing and saying his agency was developing a methane rocket that will be reusable 100 times. But the fact that a national space agency feels moved to compare itself to a company arguably validates NASA’s public-private strategy.

SpaceX’s emergence has also deprived Roscosmos of a valuable income stream.

The cost of round-trips on Russian rockets had been rising and stood at around $85 million per astronaut, according to estimates last year.

– Biden incoming –

Presidential transitions are always a difficult time for NASA, and the ascension of Joe Biden in January is expected to be no different.

The agency has yet to receive from Congress the tens of billions of dollars needed to finalize the Artemis program.

Bridenstine has announced that he will step down, to let the new president set his own goals for space exploration.

So far, Biden has not commented on the 2024 timeline.Democratic party documents say they support NASA’s Moon and Mars aspirations, but also emphasize elevating the agency’s Earth sciences division to better understand how climate change is affecting our planet. Source: https://www.daily-bangladesh.com/
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