Thursday November 21, 2019
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Warning! Growing Risk of Asteroids Hitting the Earth

A group of scientists has warned of the growing risk of a sizeable asteroid hitting the Earth

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Taurids meteor shower lights up the sky. The risk of asteroids hitting the Earth has grown over the years. Wikimedia
  • Scientists have warned about the growing risk of Asteroids hitting the Earth
  • The warning comes from Czech scientists who analyzed a recent meteor shower with 144 fireballs
  • The meteor shower, known as Taurid, has shown greater activity since 2015

What are the Taurids?

The Taurids, associated with comet Encke, are an annual meteor shower known for lighting up the skies every November. Scientists and Astronomers from Czech Academy of Sciences analyzed the Taurids and its 144 fireballs (meteors that explode in the atmosphere) have concluded their study after observing a new branch with two asteroid measuring 200-300 meters in diameter. It has a well-defined orbital structure. The risk of asteroids hitting the Earth has grown.

What does it mean?

It means that there are numerous asteroids with even larger diameter present but yet undiscovered. Every few years the Earth encounters the branches of Taurids for a period of three weeks. Addition/ Formation of new branches indicates a growing risk of an asteroid collision with Earth.

The study says that the fragments could collide with the Earth in 2022, 2025, 2032 and 2039 during the Annual Meteor Shower (November time). The asteroids are otherwise fragile, but the large ones possess the ability to penetrate deep into the atmosphere.

Interestingly, this is not the first time we have been warned about the Taurid meteors. A hypothesis says that they were also part of the ancient collisions that led our planet into an ice age.

– by Saksham Narula of NewsGram. Twitter: @Saksham2394

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Heart Rate Gets Altered in Space But Returns to Normal on Earth

Upon return to Earth, space-flown heart cells show normal structure and morphology

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Heart Rate
Relatively little is known about the role of microgravity in influencing human Heart Rate at the cellular level. Pixabay

Heart Rate gets altered in space but return to normal within 10 days on Earth, say researchers who examined cell-level cardiac function and gene expression in human heart cells cultured aboard the International Space Station (ISS) for 5.5 weeks.

Exposure to microgravity altered the expression of thousands of genes, but largely normal patterns of gene expression reappeared within 10 days after returning to Earth, according to the study published in the journal Stem Cell Reports.

“We’re surprised about how quickly human heart muscle cells are able to adapt to the environment in which they are placed, including microgravity,” said senior study author Joseph C. Wu from Stanford University.

These studies may provide insight into cellular mechanisms that could benefit astronaut health during long-duration spaceflight, or potentially lay the foundation for new insights into improving heart health on Earth.

Past studies have shown that spaceflight induces physiological changes in cardiac function, including reduced heart rate, lowered arterial pressure, and increased cardiac output.

But to date, most cardiovascular microgravity physiology studies have been conducted either in non-human models or at tissue, organ, or systemic levels.

Relatively little is known about the role of microgravity in influencing human cardiac function at the cellular level.

Heart Rate
Heart Rate gets altered in space but return to normal within 10 days on Earth, say researchers who examined cell-level cardiac function and gene expression in human heart cells cultured aboard the International Space Station (ISS) for 5.5 weeks. Pixabay

To address this question, the research team studied human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs). They generated hiPSC lines from three individuals by reprogramming blood cells, and then differentiated them into heart cells.

Beating heart cells were then sent to the ISS aboard a SpaceX spacecraft as part of a commercial resupply service mission.

Simultaneously, ground control heart cells were cultured on Earth for comparison purposes.

Upon return to Earth, space-flown heart cells showed normal structure and morphology. However, they did adapt by modifying their beating pattern and calcium recycling patterns.

In addition, the researchers performed RNA sequencing of heart cells harvested at 4.5 weeks aboard the ISS, and 10 days after returning to Earth.

These results showed that 2,635 genes were differentially expressed among flight, post-flight, and ground control samples.

Most notably, gene pathways related to mitochondrial function were expressed more in space-flown heart cells.

A comparison of the samples revealed that heart cells adopt a unique gene expression pattern during spaceflight, which reverts to one that is similar to groundside controls upon return to normal gravity, the study noted.

Heart Rate
Past studies have shown that spaceflight induces physiological changes in cardiac function, including reduced Heart Rate, lowered arterial pressure, and increased cardiac output. Pixabay

According to Wu, limitations of the study include its short duration and the use of 2D cell culture.

In future studies, the researchers plan to examine the effects of spaceflight and microgravity using more physiologically relevant hiPSC-derived 3D heart tissues with various cell types, including blood vessel cells.

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“We also plan to test different treatments on the human heart cells to determine if we can prevent some of the changes the heart cells undergo during spaceflight,” Wu said. (IANS)