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Mars, by virtue of its tenuous atmosphere and proximity to our solar system’s asteroid belt, is far more vulnerable than Earth to being struck by space rocks – one of the many differences between the two planetary neighbours.

Scientists are now gaining a fuller understanding of this Martian trait, with help from NASA’s robotic InSight lander. Researchers on Monday described how InSight detected seismic and acoustic waves from the impact of four meteorites and then calculated the location of the craters they left – the first such measurements anywhere other than Earth.

The researchers used observations from NASA’s Mars Reconnaissance Orbiter in space to confirm the crater locations.

“These seismic measurements give us a completely new tool for investigating Mars, or any other planet we can land a seismometer on,” said planetary geophysicist Bruce Banerdt of NASA’s Jet Propulsion Laboratory, the InSight mission’s principal investigator.

The space rocks InSight tracked – one landing in 2020 and the other three in 2021 – were relatively modest in size, estimated to weigh up to about 440 pounds (200kg), with diameters of up to about 20 inches (50cm) and leaving craters of up to about 24 feet (7.2meters) wide. They landed between 53 miles (85km) and 180 miles (290km) from InSight’s location. One exploded into at least three pieces that each gouged their own craters.

“We can connect a known source type, location and size to what the seismic signal looks like. We can apply this information to better understand InSight’s entire catalog of seismic events, and use the results on other planets and moons, too,” said Brown University planetary scientist Ingrid Daubar, a co-author of the study published in the journal Nature Geoscience.

The researchers believe that now the seismic signature of such impacts has been discovered they expect to find more contained in InSight’s data, going back to 2018.

The three-legged InSight – its name is short for Interior Exploration Using Seismic Investigations, Geodesy and Heat Transport – landed in 2018 in a vast and relatively flat plain just north of the Martian equator called Elysium Planitia.

“The moon is also a target for future meteor impact detection,” said planetary scientist and study lead author Raphael Garcia of the University of Toulouse’s ISAE-SUPAERO institute of aeronautics and space.

“And it may be the same sensors will do it, because the spare sensors of InSight are currently integrated in the Farside Seismic Suite instrument for a flight to the moon in 2025,” Garcia added, referring to an instrument due to be placed near the lunar south pole on the side of the moon permanently facing away from Earth.

Mars is about twice as likely as Earth to have its atmosphere hit by a meteoroid – the name for a space rock before it strikes the surface. However, Earth has a much thicker atmosphere that protects the planet.

“So meteoroids usually break up and disintegrate in the Earth’s atmosphere, forming fireballs that only rarely reach the surface to form a crater. In comparison on Mars, hundreds of impact craters are forming somewhere on the planet’s surface every year,” Daubar said.

The Martian atmosphere is only about 1 percent as thick as Earth’s. The asteroid belt, an abundant source of space rocks, is located between Mars and Jupiter.

The scientific goals set for InSight ahead of the mission were to investigate the internal structure and processes of Mars, as well as studying seismic activity and meteorite impacts.

InSight’s seismometer instrument established that Mars is seismically active, detecting more than 1,300 marsquakes. In research published last year, seismic waves detected by InSight helped decipher the internal structure of Mars, including the first estimates of the size of its large liquid metal core, thickness of its crust, and nature of its mantle.

© Thomson Reuters 2022


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2,300-Year-Old Dwarf Statuette from Alexandria Reveals Ptolemaic Art Insights

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2,300-Year-Old Dwarf Statuette from Alexandria Reveals Ptolemaic Art Insights

A 2,300-year-old marble statuette discovered in Alexandria, Egypt, has offered new insights into how dwarves were perceived during the Ptolemaic period (332–150 B.C.). Depicting a muscular, nude dwarf in motion, the 4-inch sculpture reflects a combination of Egyptian and Greek artistic traditions. Despite missing its arms, legs, and part of the head, the craftsmanship of the piece indicates a highly skilled rendering of human anatomy. It is currently housed at the Metropolitan Museum of Art in New York City.

Depictions of Dwarves in Ptolemaic Art

According to information from the Metropolitan Museum of Art, as reported by Live Science, the statuette incorporates elements from Greek art, such as classical nudity and Hellenistic realism, blended with Egyptian cultural aesthetics. This synthesis points to the cultural exchange that characterised the Ptolemaic dynasty, a period when Egypt was ruled by Ptolemy I Soter, a general of Alexander the Great. The depiction of a dwarf engaged in dance suggests a significant societal role, unlike the exaggerated caricatures of dwarves often seen in Greek art.

Egyptian Perspectives on Dwarves

Historical records indicate that dwarves were highly regarded in ancient Egypt, often serving in the households of nobles and pharaohs. Their association with the god Bes, who was depicted as a short and muscular protector of families and women in childbirth, contributed to their societal acceptance. Bes, known as a dancer and tambourine player, symbolises strength and guardianship in Egyptian mythology. The statuette’s design, which likely depicted the dwarf with a percussion instrument, aligns with this cultural significance.

A Glimpse into Cultural Integration

The artifact demonstrates the integration of different human forms into Egyptian society during the Ptolemaic era. The Met has emphasised that such depictions reflect a broader tradition of valuing diverse body types, setting the Egyptian approach apart from other ancient civilisations. This statuette, though small in size, offers a profound understanding of cultural dynamics during a transformative period in history.

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Lunar Temperature Fluctuations: Understanding the Moon’s Extreme Conditions

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Lunar Temperature Fluctuations: Understanding the Moon's Extreme Conditions

The surface temperature of the moon experiences extreme variations, making it one of the harshest environments in the solar system. During lunar daylight, temperatures can soar to over 100 degrees Celsius, while in darkness, they can plummet to minus 100 degrees Celsius. These fluctuations are caused by the absence of an atmosphere, which on Earth moderates temperature extremes. Instead, the moon’s surface directly absorbs and radiates heat depending on exposure to sunlight.

Lunar Temperature Variations Explained

According to data provided by NASA and analysed by experts, such as John Monnier, a professor of astronomy at the University of Michigan, the moon’s soil, or regolith, significantly influences these temperature shifts. Regolith is a poor conductor of heat, causing rapid temperature changes on the surface while insulating the subsurface. As reported by Live Science, during Apollo missions, measurements indicated that temperatures beneath the surface were warmer by 40 to 45 kelvins compared to the lunar exterior.

Further research using NASA’s Lunar Reconnaissance Orbiter (LRO), launched in 2009, revealed localised thermal anomalies. Findings in 2022 demonstrated that shaded areas within certain lunar pits maintained a consistent temperature of 17 degrees Celsius. These regions are considered promising for future human habitation.

The Moon’s Poles and Extreme Conditions

The lunar poles present unique thermal environments due to the sun’s low angle. Permanently shadowed craters, particularly at the south pole, may host temperatures as low as minus 248.15 degrees Celsius. These craters are shielded not only from direct sunlight but also from secondary heat sources, such as reflected solar radiation. Such locations could hold trapped ice particles, potentially vital for sustaining future lunar exploration missions.

Understanding the moon’s thermal dynamics is essential for designing equipment capable of withstanding its conditions and planning potential settlements. Scientists and engineers continue to study these extremes to ensure that future missions can navigate and thrive in the lunar environment.

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SpaceX Launches 24 Starlink Satellites to Expand Global Internet Coverage

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SpaceX Launches 24 Starlink Satellites to Expand Global Internet Coverage

The first Starlink mission of 2025 was successfully launched by SpaceX from Florida’s Cape Canaveral Space Force Station on January 6, 2025, at 2:13 a.m. IST. A Falcon 9 rocket carried 24 Starlink satellites into orbit, aiming to expand SpaceX’s vast satellite internet network. The launch marked another significant step in SpaceX’s efforts to enhance global connectivity through its growing constellation of satellites.

Details of the Mission

According to a report from space.com, the Falcon 9 rocket’s first stage completed a flawless return to Earth, landing on the droneship “Just Read the Instructions,” positioned in the Atlantic Ocean. This milestone represented the 17th launch and recovery for this particular booster. SpaceX confirmed that this booster has supported 10 prior Starlink missions and was used in the Crew-5 mission, which transported astronauts to the International Space Station.

The upper stage of the rocket is expected to deploy the 24 satellites into low Earth orbit approximately 65 minutes after liftoff. These satellites will join the more than 6,850 active Starlink spacecraft currently operating, as stated to space.com by astrophysicist Jonathan McDowell, who tracks satellite constellations.

Starlink, developed by SpaceX, is the largest satellite network in history. Its purpose is to deliver high-speed internet access globally, including remote and underserved areas. With launches like this, the constellation continues to grow, reinforcing SpaceX’s position as a leader in satellite-based internet services. This launch follows a year of record-breaking achievements for SpaceX, which conducted numerous successful missions in 2024. The company remains focused on accelerating its deployment of satellites, with regular launches planned throughout 2025.

As SpaceX continues its Starlink initiative, its impact on global connectivity and advancements in reusable rocket technology remain noteworthy. The company’s commitment to innovation in space exploration is expected to shape the future of satellite communications.

Catch the latest from the Consumer Electronics Show on Gadgets 360, at our CES 2025 hub.

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