Connect with us

Published

3 years ago

on

Every single time NASA shares a picture of space on Twitter or Instagram and explains what it is about, many in the comments section ask how these photographs were taken, whether the colours are real, and, most importantly, they enquire about the cameras that the Hubble Telescope is equipped with. The space agency, in its latest post on Instagram, said it got that question often and, therefore, wanted to break it down for space enthusiasts. To begin with, NASA’s Hubble Space Telescope doesn’t take a snapshot and get the image back in colour, something a mobile phone camera does.

NASA said that Hubble’s camera takes photos over a broad range of wavelengths that come down to Earth in grayscale. This is followed by scientists creating colour images by taking exposures using different colour filters on the telescope, assigning a colour to each filter corresponding to the wavelength, and combining the images.

The space agency said that many of the full-colour photographs shared by Hubble are created after combining three separate exposures — one each taken in red, green, and blue light.

“When mixed, these three colours can recreate almost any colour of light that is visible to human eyes,” NASA said in the post. “That’s how televisions, computer monitors, and video cameras recreate colours to show a picture!”

NASA said that scientists use the closest approximation of the Ultraviolet and Infrared spectrum in the visible light spectrum to represent that information. This, the agency said, is done because we can’t see the colours in the Ultraviolet and Infrared spectrum. It said that the colour in Hubble images is used to highlight interesting features of the celestial object being studied. And then the agency explained it with the help of an example.

Sharing a picture of The Ring Nebula, NASA said that the deep blue colour in the centre, shown in visible light, represents helium, the inner ring, shown in cyan colour, is the glow of hydrogen and oxygen, while the reddish outer ring is from nitrogen and sulphur. So, that’s how the pictures taken by NASA’s Hubble Telescope are created.

Meanwhile, the space agency on Monday shared two photographs of the space on Twitter and wrote: “Hubble’s back!”

One of the pictures shows a three-armed spiral galaxy. NASA added in the caption, “After the Hubble team successfully turned on backup hardware aboard the telescope, the observatory got back to work over the weekend and took these galaxy snapshots.”

Related Topics:
Continue Reading

Science

Mealworms Can Eat Plastic, But Study Shows Limited Impact on Pollution Crisis

Published

2 hours ago

on

December 4, 2024

By

Mealworms Can Eat Plastic, But Study Shows Limited Impact on Pollution Crisis

An experiment conducted by researchers at the University of British Columbia has revealed the limited potential of mealworms in addressing plastic pollution. The study, published in Biology Letters on December 4, estimated that 100 mealworms would take approximately 138 days, or 4.5 months, to consume a single disposable face mask made from polypropylene. The findings underscore the challenges of relying on insect larvae for large-scale plastic degradation as per various reports.

Plastic Pollution and Microplastics: A Growing Concern

The research focused on microplastics, which are plastic fragments smaller than 5 millimetres and linked to severe health issues such as increased risks of heart attacks and strokes, as suggested by prior studies. Earlier experiments had demonstrated the ability of several insect species, including yellow mealworms (Tenebrio molitor) and superworms (Zophobas atratus), to degrade various types of plastics. However, most of those studies utilised powdered or pure forms of plastic, rather than the manufactured items people use daily, as reported by researchers.

Real-World Testing and Observations

Led by ecologist Dr Michelle Tseng, the team opted for a more realistic approach by using disposable face masks containing additional materials from manufacturing processes. To encourage consumption, the plastic was processed into microbits and blended with wheat bran. According to Dr Tseng in a statement, the insects readily consumed this mixture, termed “face-mask granola.”

No significant reduction in the insects’ lifespan was observed. However, questions regarding the safety of using these larvae as feedstock in agriculture, particularly for poultry, were raised. Dr Tseng noted that mealworms consuming large amounts of microplastics may not remain safe for further use in food chains, as reported.

Challenges and Future Directions

The feasibility of using mealworms for large-scale plastic degradation remains doubtful due to the slow consumption rate. During the peak of the COVID-19 pandemic, Asia alone reportedly used 2 billion face masks per day, highlighting the impracticality of such a solution. Researchers have suggested that exploring the microbial composition of these insects could lead to advancements in waste breakdown technologies. Nonetheless, reducing plastic usage is emphasised as the most effective approach to managing this environmental crisis.

Continue Reading

Science

Climate Change Causes Decline in Rice Quality Across East Asia, New Study Suggests

Published

3 hours ago

on

December 4, 2024

By

Climate Change Causes Decline in Rice Quality Across East Asia, New Study Suggests

A decline in rice quality across East Asia has been attributed to climate warming, according to a study published in Geophysical Research Letters. The research, led by Dr Xianfeng Liu of Shaanxi Normal University in China, highlights the vulnerability of rice—a dietary staple for billions—to rising temperatures. Using 35 years of data from Japan and China, the team analysed how various climate factors affect the “head rice rate” (HRR), a critical measure of rice quality based on the proportion of intact grains after milling.

Key Climate Factors Impacting Rice Quality

The study identified warmer nighttime temperatures as the primary driver behind reduced rice quality, as per reports. For Japan, HRR began declining at night temperatures exceeding 12 degrees Celsius, while for China, the threshold was 18 degrees celsius. Elevated nighttime temperatures during flowering and grain development phases were found to hinder photosynthesis and starch accumulation, causing more grains to break during processing.

Reportedly, solar radiation emerged as the second most significant factor, with higher radiation levels linked to reduced HRR. Other contributing factors included reduced precipitation and increased daytime vapor pressure deficit, with HRR declining when the latter exceeded 0.5–1 kPa.

Projected Declines in Rice Quality

As per multiple reports, projections under moderate and high greenhouse gas emissions scenarios suggest that rice quality will continue to deteriorate. Between 2020 and 2100, HRR is expected to decline by up to 1.5 percent in Japan and 5 percent in China, with the impact intensifying after 2050 under higher emissions. Southern regions in both countries, closer to the equator and more vulnerable to rising nighttime temperatures, face the greatest challenges.

Implications for Food Security

The findings raise concerns over the adaptability of rice cultivars to climate change. Southern provinces in China, the nation’s primary rice-growing regions, may struggle to mitigate these impacts, posing risks to food security, human nutrition, and economic stability. The study underscores the urgent need for climate-resilient agricultural practices and crop varieties to safeguard global rice supplies.

Continue Reading

Science

NASA’s James Webb Space Telescope Discovers Fourth Planet in Kepler-51 System

Published

4 hours ago

on

December 4, 2024

By

NASA's James Webb Space Telescope Discovers Fourth Planet in Kepler-51 System

A recent study published in The Astronomical Journal has revealed the discovery of a fourth planet in the Kepler-51 system, an already remarkable planetary system known for hosting three ultra-low-density “super-puff” planets. This discovery was made by a research team led by Dr Jessica Libby-Roberts, a postdoctoral fellow at Penn State’s Centre for Exoplanets and Habitable Worlds, and Dr Kento Masuda, Associate Professor of Earth and Space Science at Osaka University. The finding suggests that the gravitational influence of the newly identified planet, named Kepler-51e, explains unexpected variations in the transit timings of the system’s known planets.

Unexpected Findings During Observations

As per a report by Phys.org, the researchers initially aimed to study Kepler-51d using NASA’s James Webb Space Telescope (JWST) but observed its transit occurring two hours earlier than predicted. This significant deviation prompted further analysis of data from NASA’s Kepler and TESS telescopes, Hubble Space Telescope and ground-based observatories such as the Apache Point Observatory (APO) and Palomar Observatory, as per reports. According to the team, only a four-planet model could account for the observed transit timing variations.

Insights Into the Kepler-51 System

Kepler-51e is believed to have a mass comparable to the existing planets in the system, following a relatively circular orbit of approximately 264 days. However, its classification as a “super-puff” remains uncertain due to the lack of transit data needed to calculate its radius and density. The inner three planets, known for their extremely low densities, continue to intrigue scientists. The team noted that accounting for the fourth planet alters previously estimated masses of the inner planets, slightly increasing their values while maintaining their status as super-puffs.

Future Implications of the Study

Dr Libby-Roberts, in a statement, indicated the potential for further exploration, stating that Kepler-51e’s orbit, located just inside the system’s habitable zone, suggests the possibility of additional planets or complex gravitational interactions. Continued observations may uncover planets farther from the star, contributing to the search for potentially habitable worlds. Researchers are also analysing data from JWST to study the atmospheric composition of Kepler-51d, which may shed light on the formation mechanisms of such unusual planets.

For the latest tech news and reviews, follow Gadgets 360 on X, Facebook, WhatsApp, Threads and Google News. For the latest videos on gadgets and tech, subscribe to our YouTube channel. If you want to know everything about top influencers, follow our in-house Who’sThat360 on Instagram and YouTube.


Gold and Silver Jewellery Found in 1,600-Year-Old Aristocratic Burials in Crimea



NASA Develops Robotic Technologies for Autonomous Exploration of Ocean Worlds

Continue Reading

Trending