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As anticipation grows for India’s planned Chandrayaan-3 lunar landing on Wednesday, an expert delves into the fascinating world of Moon exploration. The Moon has captivated human curiosity for centuries, and with each new mission, we uncover more about its geological history, composition, and potential for scientific discovery.

Dr. TV Venkateswaran, a scientist at Vigyan Prasar, an autonomous organisation under the Department of Science and Technology (DST), and a member of the public outreach committee of the Astronomical Society of India, answers key questions about the Moon’s geological evolution, the significance of its south pole, the presence of water and ice, and India’s ambitious plans for lunar exploration.

What is Moon’s geological history and evolution? In other words, how old it is, and when/how did it form?

The Moon is estimated to be about 4.5 billion years old, roughly the same age as the Earth. The leading theory about the Moon’s formation suggests that a Mars-sized celestial body collided with the young Earth, and the debris from this collision eventually coalesced to form the lunar body. However, current geological evidence from Moon suggests that it may be younger by just 60 million years compared to Earth.

How much do things weigh on the Moon, relative to Earth, and why?

The Moon’s gravitational pull is much weaker than Earth’s, approximately one-sixth of Earth’s gravity. As a result, objects on the Moon weigh significantly less than they do on Earth. This is due to the Moon’s smaller size and mass. For example, a person weighing 68 kilograms on the Earth would weigh only over 11 kg on the Moon.

Why do Indian scientists want to land on Moon’s south pole?

The lunar south pole has become a focal point for exploration due to its unique features and potential scientific value. It is believed to host a vast reservoir of water ice in permanently shadowed regions. The presence of water is of immense significance for future space exploration, as it can be converted into resources such as drinking water, oxygen, and hydrogen for rocket fuel. Also, the permanently sunlit area in the region has a temperature of around minus 50 to 10 degrees Celsius, which provide a better chemical condition for the electronics onboard the rover and lander to work properly.

What is in the lunar south pole? Is the terrain and geology there the same as elsewhere on the Moon or do we have no idea?

The terrain and geology at the Moon’s south pole are distinct from other regions. Permanently shadowed craters provide extremely cold conditions that allow water ice to accumulate and persist. The unique geography of the south pole also creates regions of perpetual sunlight, which can be harnessed for solar power. The terrain varies from rugged landscapes to relatively flat plains, offering a diverse range of scientific opportunities.

Why is a region of the lunar south pole permanently shadowed?

This depends on the Moon’s geology. The Moon’s axis is only slightly tilted relative to its orbit around the Earth. This results in certain areas near the poles being in permanent shadow. These shadows create extremely cold environments where temperatures can plummet to very low levels. These frigid conditions are conducive to preserving water ice for billions of years.

Does water/ice exist on the lunar south pole? Chandrayaan-1 seemed to have suggested it.

Yes, water ice has been confirmed to exist in the Moon’s south pole region. Data from various lunar missions, including India’s Chandrayaan 1, launched in 2008, have indicated the presence of water molecules in these permanently shadowed regions. This discovery has opened up exciting possibilities for sustained lunar exploration.

Is water/ice critical for future lunar exploration?

Water ice is a critical resource for future lunar exploration and even beyond. It can be converted into breathable air, drinking water, and most importantly, hydrogen and oxygen for rocket fuel. This could revolutionise space travel by reducing the need to transport these resources from Earth, making long-duration missions more feasible.

Does India plan to send a manned mission to the Moon in the future?

While ISRO has expressed its intention to send astronauts to space as part of its Gaganyaan mission, there are no plans yet to send human missions to the Moon in the near future.


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SpaceX Successfully Launches 23 Starlink Satellites on Brand-New Falcon 9 Rocket

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SpaceX Successfully Launches 23 Starlink Satellites on Brand-New Falcon 9 Rocket

SpaceX marked its 60th Falcon 9 flight of 2025 by successfully launching a brand-new Falcon 9 booster rocket on the 20th of May. This rocket carries 23 Starlink V2 Mini satellites into low Earth orbit. Among those, 13 feature Direct to Cell capabilities. Originally, it was targeting 11:58 p.m. EDT on May 19 (0358 UTC on May 20) for the launch, but that try was aborted just before liftoff, for reasons that the company did not immediately explain. It was finally launched on Tuesday (May 20) at 11:19 p.m. EDT (0319 GMT on May 21) from the Space Launch Complex 40 at Cape Canaveral Space Force Station in Florida.

About the launch

According to SpaceX’s mission overview, this was the first-ever launch for this particular Falcon 9’s (booster B1095) first stage. While most recent SpaceX missions have reused Falcon 9 boosters , a signature part of the company’s cost-saving and sustainability strategy ,Tuesday’s flight featured a rare first-stage debut.

The rocket successfully completed its initial mission, separating from the upper stage around two and a half minutes after liftoff. About eight minutes later, the booster made a precise landing on the SpaceX drone ship “Just Read the Instructions,” stationed in the Atlantic Ocean. This smooth recovery sets the stage for future reusability of the rocket.

Technical Advancement

Of the 23 satellites onboard, 13 were outfitted with direct-to-cell technology — a feature designed to enable satellite connectivity directly to mobile phones, especially in areas lacking terrestrial infrastructure. After reaching space, the rocket’s second stage performed a short engine burn to circularize the orbit before deploying the satellites about 65 minutes after launch.

Starlink is the largest satellite megaconstellation ever constructed, consisting of about 7,500 operational satellites at the moment. And that number is growing all the time, as Tuesday’s action shows.

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Polaris Wasn’t Always the North Star: How Earth’s Wobble Shifts the Celestial Pole

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Polaris Wasn’t Always the North Star: How Earth’s Wobble Shifts the Celestial Pole

Polaris has been the constant guide for explorers and navigators in the northern hemisphere for thousands of years, hence its other name, the famous North Star. It is significant where it is located near the north rotational axis of Earth, and the whole sky appears to spin about it. But that’s not always been the case, and it won’t always be the case. The planet’s sluggish axial wobble, called precession, makes the pole trace a circle about every 26,000 years, bringing different stars into view over the ages.

How Earth’s 26,000-Year Axial Precession Shifts the North Star Over Time

As per NASA, gravitational forces from the sun and moon affect the rotation of Earth; these produce a bulge at the equator and axial precession. Every 26,000 years or so, this wobble makes a complete circle, and it makes the celestial pole move on a cycle, pointing to stars in sequence over time. Thuban, in the star constellation Draco, was the closest visible in the sky to the celestial pole some 4,700 years ago. The stars, such as Kochab and Pherkad, were the nearest to the pole about 3,000 years ago. Polaris now has the title, but not for very long.

The axis of the Earth will eventually change again, bringing new stars into prominence. In about 2,200 years, Errai in the constellation Cepheus will become the North Star. Alderamin, likewise in Cepheus, will have its turn some 5,000 years from now. Deneb, who will approach the pole once more about 9,800 CE, and Vega, a former pole star, returning in roughly 12,000 years, complete this cycle.
Many of these stars fit identifiable constellations, including Cepheus, Draco, and Ursa Minor. Modern stargazing apps incorporating augmented reality for nighttime sky navigation allow amateur astronomers to trace their positions.

As Polaris continues to shine overhead today, its reign is only temporary. Earth’s steady 26,000-year precessional cycle guarantees that other stars will eventually take its place, proving that even in the cosmos, change is constant.

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Scientists Warn of Inadequate Solar Storm Forecasting: What You Need to Know

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Scientists Warn of Inadequate Solar Storm Forecasting: What You Need to Know

Imagine being told a storm is approaching, but you won’t know how dangerous it truly is until minutes before impact. That’s the reality scientists face with solar storms. Although scientists have improved our ability to monitor coronal mass ejections (CMEs) from the Sun and project their arrival at Earth, the most important consideration — the orientation of the storm’s magnetic field — remains unknown until the very last minute. This direction, referred to as the Bz component, decides whether the CME will pass by with little influence or cause disturbances to satellites, electricity grids, and GPS systems.

Lack of Early Bz Data Leaves Earth Vulnerable to Solar Storms, Scientists Urge Wider Sun Coverage

As per a report on Space.com, solar physicist Valentín Martínez Pillet emphasised that knowing the Bz value earlier could dramatically improve our ability to prepare. Currently, spacecraft like NASA’s ACE and DSCOVR detect Bz only when the CME reaches Lagrange Point 1 (L1), giving us just 15 to 60 minutes’ warning. Martínez Pillet predicts it could take 50 years to achieve the forecasting precision we have for Earth’s weather unless we expand our view of the Sun with new satellites placed at Lagrange points L4, L5, and L3.

Despite having the scientific models needed, Martínez Pillet argues we lack vital real-time data from different solar perspectives. Most observations currently come from a single vantage point — L1, which limits our predictive ability. Missions like ESA’s upcoming Vigil, scheduled for launch in 2031 to L5, aim to fill this gap by detecting the CME’s shape and magnetic orientation from the side, potentially giving up to a week’s notice.

But decades may be too long to wait. History reminds us of the danger: the 1859 Carrington Event caused telegraph failures, and a near miss in 2012 could have caused trillions in damage if it had struck Earth. In a 2013 paper, Dan Baker of LASP warned that a direct hit would have left the modern world technologically crippled.

Today, tools like the Global Oscillation Network Group (GONG) and DSCOVR offer continuous solar monitoring, but their limitations emphasise the need to provide broader coverage. “The Sun isn’t changing,” Martínez Pillet said. “It’s our dependence on technology that’s made us more vulnerable.” Until we build the infrastructure to see solar storms before they hit, we may remain dangerously exposed.

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