Moon’s Hidden Ice Revealed: Chandrayaan‑2 Uncovers Subsurface Water at Lunar South Pole

Representative Image

ISRO’s Chandrayaan‑2 orbiter has provided strong evidence of buried water‑ice beneath the Moon’s south polar craters, especially inside the 1.1 km‑wide Faustini crater, using advanced radar scans. This breakthrough could be crucial for future lunar missions, resource utilization, and even human habitation.

The Dual Frequency Synthetic Aperture Radar (DFSAR) on the Chandrayaan‑2 orbiter is a special radar camera that uses microwave signals to study the Moon. It works in two frequency ranges called L‑band and S‑band and is the first radar of its kind to give a complete picture of the Moon’s surface.

Scientists used it to study “doubly shadowed craters” — deep holes inside areas that never get sunlight. Because these places stay extremely cold (around ‑248°C), they can hold water‑ice for billions of years, making them important for future space missions.

Key Findings

India’s lunar exploration programme has achieved another significant scientific breakthrough, with scientists analysing Chandrayaan-2 data finding strong evidence of subsurface water-ice beneath craters near the Moon’s South Pole.

The discovery, made using the Dual Frequency… pic.twitter.com/jJ2OwNl9is

— PB-SHABD (@PBSHABD) May 29, 2026

• Instrument Used: Dual Frequency Synthetic Aperture Radar (DFSAR), the first fully polarimetric radar system to study the Moon.
• Location: Permanently shadowed regions (PSRs) near the south pole, where temperatures drop to ~25K (‑248°C).
• Evidence: Radar polarimetric analysis showed Circular Polarization Ratio (CPR > 1) and Degree of Polarization (DOP < 0.13) — signatures consistent with subsurface ice.
• Strongest Signal: A 1.1 km crater inside Faustini displayed lobate‑rim morphology, suggesting an impact penetrated subsurface ice.

Why It Matters

• Future Missions: Buried ice could supply drinking water, oxygen, and rocket fuel, reducing dependence on Earth launches.
• Global Space Race: The Moon’s south pole is already a prime target for NASA’s Artemis program and other international missions.
• India’s Role: This discovery strengthens ISRO’s position as a key player in global lunar exploration, complementing Chandrayaan‑3’s success and India’s Space Vision 2047 roadmap.

Technical Insights

Feature	Details
DFSAR Radar	Operates in L‑ and S‑bands, penetrates up to 2 meters below surface.
Target Regions	“Doubly shadowed craters” — craters inside larger PSRs, never exposed to sunlight.
Temperature	~25K (‑248°C), ideal for preserving ice for billions of years.
Detection Method	CPR & DOP values distinguish ice from rocky terrain.

Challenges Ahead

• Extreme Cold: Equipment must withstand temperatures near absolute zero.
• Accessibility: Ice is buried beneath crater floors, not easily scoopable.
• Verification: Future missions must confirm deposits with direct sampling.

📸 Visual Context

Indian Scientists Discover New Quantum Phenomenon

Indian researchers have discovered that preparing two quantum bits with opposite spins (antiparallel) can reveal more information than two identical copies, a finding that could improve how we test quantum devices and strengthen quantum cryptography.

The study result touches the very heart of quantum theory.

In normal physics, you can measure many things at once — like the speed and weight of a car — and the only limits are practical ones, such as how good your tools are.

But in the quantum world, nature itself sets strict boundaries. Rules like the Heisenberg uncertainty principle and Bohr’s complementarity principle say you can’t know certain pairs of properties perfectly at the same time.

The new research shows something surprising: if you prepare particles in a clever way, you can get around some of these restrictions. In other words, by flipping how the particles are set up, scientists can sometimes learn more than the usual limits would allow.

What the discovery is

• Scientists from S. N. Bose National Centre for Basic Sciences, Balagarh Bijoy Krishna Mahavidyalaya, and Indian Statistical Institute, Kolkata showed that a pair of qubits prepared with antiparallel spins can be used to predict three mutually incompatible spin components simultaneously — something not possible with two identical (parallel) qubits.
• This result was reported in a recent paper and highlighted by an official press release.

Why this is surprising (in simple words)

Simultaneous measurement of spin properties along three mutually orthogonal space directions becomes possible on antiparallel qubit-pair.

• In everyday life, two identical copies usually give you more confidence about something.
• In quantum physics, measuring one property can disturb another (think of trying to measure both the exact position and speed of a tiny particle). This is known as complementarity and is related to the Heisenberg uncertainty principle.
• The new work shows that flipping one qubit against the other can, in some tasks, beat identical copies — letting you extract information that seemed forbidden before.

How it works (brief, non–technical)

• Qubits have a property called spin, which can point in different directions.
• Some spin measurements are incompatible: knowing one precisely prevents knowing another.
• By preparing two qubits in an antiparallel arrangement, researchers found measurement strategies that make three such incompatible spin components effectively compatible for that pair — enabling richer joint measurements.

Practical implications

• Device characterization: Better ways to probe unknown quantum devices using fewer resources, speeding up testing and calibration.
• Quantum cryptography: Protocols that rely on extracting or hiding information from qubits may be redesigned to use antiparallel pairs for improved performance or security.

Big picture

• This result touches the foundations of quantum theory: it shows that how you prepare quantum systems matters as much as what you measure.
• It also echoes famous quantum puzzles (like the Mean King’s problem) where clever preparation and measurement strategies unlock surprising capabilities.

Quick takeaway for non‑experts

• Opposites can be more revealing than twins in the quantum world. By preparing qubits in opposite states, scientists can sometimes get around measurement limits that once seemed absolute — a small twist with potentially big technological payoff.

Simple Analogy

Think of two clues in a mystery: if both clues are identical, you don’t learn much. But if one clue is the opposite of the other, suddenly the full picture becomes clearer. That’s what these scientists found in the quantum world.

For the official announcement and institutional details, see the published paper in Physical Review Letters.

Quantum measurement limits are the fundamental restrictions in physics that prevent us from knowing all properties of a quantum system with perfect precision at the same time. These limits arise from the Heisenberg uncertainty principle and the unavoidable “back‑action” of measurement itself.

Core Principles

• Heisenberg uncertainty principle: You cannot simultaneously measure certain pairs of properties (like position and momentum, or spin along different axes) with unlimited accuracy.
• Bohr’s complementarity: Some properties are mutually exclusive — observing one prevents full knowledge of the other.
• Measurement back‑action: The act of measuring disturbs the system. For example, shining light to detect a particle’s position changes its momentum.

Types of Quantum Limits

Limit	Definition	Example
Heisenberg Limit	Absolute bound on precision due to uncertainty principle.	Position vs. momentum trade‑off.
Standard Quantum Limit (SQL)	Practical bound in interferometry and sensing with natural quantum states.	Laser interferometers in gravitational wave detectors.
Quantum Noise Limit	Added noise from amplifiers or detectors that cannot be eliminated.	Photon shot noise in optical measurements.

Everyday Analogy

Imagine trying to photograph a moving car at night.

• A brighter flash gives you a clearer picture of its position but blurs its speed.
• A longer exposure shows speed streaks but loses exact position.

This trade‑off mirrors quantum limits: you can’t have both perfectly at once.

Why It Matters

• Quantum computing: Easier testing and calibration of new technologies. Limits affect how qubits can be read without destroying information.
• Quantum cryptography: Stronger security for communication, since more information can be extracted from fewer resources.  
• Quantum metrology: Advanced techniques like entanglement and squeezed states help push beyond the standard quantum limit for ultra‑precise sensors.

Key Takeaway

Quantum measurement limits are not technological flaws — they are built into nature itself. By preparing states cleverly (like antiparallel spins), scientists can sometimes circumvent practical limits and extract more information than intuition suggests.

This discovery highlights a deep truth: in quantum physics, contrast can be more powerful than sameness. It could speed up progress in quantum computing, secure communication, and even reshape how we understand the limits of nature.

Scientists Discover a New Organ Inside Your Throat

Scientists at the Netherlands Cancer Institute have identified a previously unknown set of salivary glands located deep inside the human throat, specifically in the nasopharynx—the area behind the nose and above the throat.

What is Found:

• Name: Tubarial salivary glands
• Size: Approximately 3.9 cm long
• Location: Over the cartilage called the torus tubarius
• Function: Likely to lubricate and moisten the upper throat

Anatomy of the torus tubarius area. Macroscopic views of the torus tubarius area. Global anatomical overview with the area of interest in yellow and dissection planes in red (A) with aligned dissection specimen of the right nasopharynx, including a probe showing the auditory tube (B) and annotated graphical overview (C).

How It Was Discovered:

• Spotted during PSMA PET-CT scans used for prostate cancer detection
• Scans revealed salivary gland-like tissue lighting up in a previously overlooked region

Confirmed by:

• Imaging of 100 patients showing consistent gland structure
• Dissection of two cadavers verifying mucosal gland tissue and ducts

Why It Matters:

• Could reshape radiotherapy practices for head and neck cancers
• May explain post-treatment issues like dry mouth and swallowing difficulties
• Highlights the power of advanced imaging in anatomical discoveries