Dust EXperiment (DEX)
Kartavya Desk Staff
Source: IE
Subject: Science and Technology
Context: ISRO has confirmed that an interplanetary dust particle (IDP) enters Earth’s atmosphere roughly every 16 minutes, based on measurements from India’s first cosmic dust detector Dust EXperiment (DEX).
About Dust EXperiment (DEX):
What it is?
• DEX is India’s first indigenously developed cosmic dust detector, designed to detect and measure high-speed interplanetary and orbital dust particles impacting Earth’s upper atmosphere.
Developed by:
• Indian Space Research Organisation (ISRO)
• Developed by Physical Research Laboratory (PRL), Ahmedabad
• Flown aboard PSLV Orbital Experimental Module (POEM) of the PSLV-C58 XPoSat mission.
Aim: To directly measure cosmic dust flux in Earth’s atmosphere and generate mission-critical data for space environment monitoring, satellite safety, and future crewed deep-space missions.
Key features:
• Hypervelocity principle: Detects dust impacts travelling at >4 km/s, capable of melting or disintegrating on impact.
• Compact & efficient: 3 kg payload with ultra-low 4.5 W power consumption.
• Wide field of view: 140° detector for enhanced hit probability.
• Low-Earth orbit testing: Operated at ~350 km altitude with 9.5° inclination.
• High detection rate: Logged impacts at a rate of ~1 particle per 1,000 seconds.
• Measured dust flux: ~6.5 × 10⁻³ particles m⁻² s⁻¹, validating global dust models.
About Interplanetary Dust Particles (IDPs):
• What they are? IDPs are microscopic fragments of comets, asteroids, and meteoroids that constantly rain onto planetary atmospheres and produce the “meteor layer”, visible occasionally as shooting stars.
• IDPs are microscopic fragments of comets, asteroids, and meteoroids that constantly rain onto planetary atmospheres and produce the “meteor layer”, visible occasionally as shooting stars.
• How they are formed?
• Cometary debris: Released when comets heat up near the Sun. Asteroidal collisions: Generated from high-energy impacts in the asteroid belt. Cosmic erosion: Gradual breakdown of celestial bodies over millions of years.
• Cometary debris: Released when comets heat up near the Sun.
• Asteroidal collisions: Generated from high-energy impacts in the asteroid belt.
• Cosmic erosion: Gradual breakdown of celestial bodies over millions of years.
• Implications:
• Spacecraft safety: Even tiny particles at hypervelocity can cause catastrophic damage to satellites and crewed spacecraft. Space weather & environment: Influence orbital debris dynamics and near-Earth space conditions. Planetary science: Provide clues about early solar system evolution. Future missions: DEX-like instruments can enable first-ever dust measurements in Venusian and Martian atmospheres, and around the Moon—crucial for Moon-Mars human exploration.
• Spacecraft safety: Even tiny particles at hypervelocity can cause catastrophic damage to satellites and crewed spacecraft.
• Space weather & environment: Influence orbital debris dynamics and near-Earth space conditions.
• Planetary science: Provide clues about early solar system evolution.
• Future missions: DEX-like instruments can enable first-ever dust measurements in Venusian and Martian atmospheres, and around the Moon—crucial for Moon-Mars human exploration.