Shukrayaan: India’s Venus Mission Explained

Shukrayaan, formally Shukrayaan-1 or the Venus Orbiter Mission (VOM), is a planned Indian space mission by the Indian Space Research Organisation (ISRO) to place a scientific spacecraft in orbit around the planet Venus and study its surface, thick atmosphere and interaction with the Sun. The Union Cabinet approved the mission in September 2024, and it is intended for launch later this decade; it has not flown yet, and its schedule and instrument details remain subject to ISRO’s development and testing.

The name combines “Shukra”, the Sanskrit name for Venus, with “yaan”, meaning craft or vehicle. Shukrayaan would be India’s first mission to Venus and the country’s third major interplanetary effort after the Moon missions of the Chandrayaan series and the Mars Orbiter Mission, popularly called Mangalyaan. This explainer describes the mission’s goals, planned instruments, difficulties and place in India’s space programme, and was last reviewed on 15 October 2026.

Quick Facts: Shukrayaan at a Glance

Key Takeaways

• Shukrayaan-1 is ISRO’s planned Venus Orbiter Mission, approved by the Union Cabinet in September 2024.
• Shukrayaan is designed as an orbiter that studies Venus from space, and it will not land on the surface, which is hot enough to destroy most spacecraft quickly.
• The mission’s science covers the Venusian surface and subsurface, the dense carbon dioxide atmosphere with sulphuric-acid clouds, and the planet’s interaction with solar wind and space weather.
• A synthetic aperture radar is one of the main planned instruments, because radar can image the surface through Venus’s permanent cloud cover.
• Venus has a surface temperature near 460 to 470 degrees Celsius and an atmospheric pressure at the surface about 90 times that of Earth.
• Shukrayaan would follow Chandrayaan and Mangalyaan as India’s next planetary science mission and is separate from the crewed Gaganyaan programme.

What Is Shukrayaan?

Shukrayaan is an ISRO mission to send an orbiter to Venus in order to study the planet’s surface, atmosphere and space environment over a period of several years. It is designated Shukrayaan-1 because it is intended to be the first in what ISRO hopes will be a line of Venus missions.

The idea of an Indian Venus mission has been discussed in the Indian space-science community for more than a decade. ISRO invited scientists to propose instruments for a Venus orbiter in the 2010s, and the mission appeared in long-term space science planning. The Union Cabinet approval in 2024 turned the concept into a funded project with a schedule.

The spacecraft will be a mid-sized orbiter carrying a suite of scientific instruments. It is planned to enter a long, elliptical orbit around Venus. ISRO has also studied the use of aerobraking, a technique in which a spacecraft skims the upper atmosphere repeatedly to reduce its speed and adjust its orbit using little fuel.

Why Is ISRO Sending a Mission to Venus?

ISRO is sending a mission to Venus because Venus is Earth’s closest planetary neighbour and nearest in size, yet it evolved into a hostile world, and understanding that divergence is a major scientific question. Venus has about 95 per cent of Earth’s diameter and a similar mass, and scientists believe it may once have had water and a more temperate climate.

Several reasons support the mission:

• Planetary science: Venus offers a test case for how planets lose water and develop a runaway greenhouse effect.
• Climate science: studying the extreme greenhouse atmosphere of Venus helps scientists test models relevant to Earth’s own climate.
• Exoplanet research: many planets found around other stars are of Earth-like size, and Venus is the nearby example of one that turned inhospitable.
• Capability building: an orbiter around Venus demands precise navigation, long-duration operation and communications over large distances.
• Scientific community: the mission gives Indian researchers access to new data and the chance to develop instruments.

Venus has also had fewer recent missions than Mars or the Moon, so new data would be valuable. The mission can build on the findings of earlier spacecraft while taking different measurements.

What Are the Scientific Objectives of Shukrayaan?

The scientific objectives of Shukrayaan are to study the Venusian surface and subsurface, to examine the structure and chemistry of the atmosphere, and to understand how the Sun and the solar wind affect the planet. These three areas correspond to the planet’s interior and geology, its atmosphere, and its space environment.

Surface and subsurface

The mission aims to map surface features and search for signs of recent or ongoing volcanic and tectonic activity. Venus is covered by volcanic plains, large mountains and unusual features, but scientists still debate how active the planet is today. Radar mapping can help identify surface changes, lava flows and the age of different regions, and some instruments are expected to probe a short distance below the surface.

Atmosphere and clouds

The Venusian atmosphere is made up of roughly 96 per cent carbon dioxide, with clouds containing droplets of sulphuric acid at altitudes of around 45 to 70 km. Winds at the cloud tops circle the planet in only a few Earth days, much faster than the planet itself rotates, a phenomenon called super-rotation. Shukrayaan would study the composition, temperature structure, dynamics and chemistry of this atmosphere, including sulphur-bearing gases.

Solar and space weather interaction

Venus has no strong global magnetic field like Earth’s, so the solar wind interacts directly with its upper atmosphere and ionosphere. Measuring how charged particles and the Sun’s radiation strip gases from the planet helps explain how Venus may have lost its water over geological time.

What Instruments Will Shukrayaan Carry?

Shukrayaan is planned to carry a set of scientific payloads, including an S-band synthetic aperture radar, instruments to study the atmosphere and cloud chemistry, and sensors to measure plasma and charged particles. The final payload list is subject to ISRO’s evaluation and design process, and some instruments may involve international scientific partners.

The synthetic aperture radar is the signature instrument. SAR works by using the spacecraft’s motion to simulate a much larger antenna and thereby produce detailed images. India already has experience with SAR through the RISAT radar imaging satellites and the NISAR mission, a joint project with NASA, so a Venus radar would build on existing skills.

How Will Shukrayaan Reach and Operate Around Venus?

Shukrayaan will reach Venus by launching on a heavy-lift rocket during an Earth-Venus launch window and travelling for several months through interplanetary space before firing its engines to enter orbit. Venus launch opportunities recur about every 19 months, because the relative positions of Earth and Venus repeat on that cycle.

ISRO plans to use its LVM3 rocket, which launched Chandrayaan-3 in 2023. The spacecraft would probably use gravity-assisted trajectories or direct transfers, with ISRO designing the path to minimise fuel and risk. After arrival, the spacecraft would be inserted into an elliptical orbit that allows it to examine the planet at both low and high altitudes.

Operations around Venus bring particular needs:

• Thermal control, since Venus is closer to the Sun than Earth and sunlight is stronger.
• Long-distance communication through the Indian Deep Space Network, which has large antennas near Bengaluru.
• Precise navigation and orbit insertion, as there is little room for error.
• Power from solar panels that must cope with intense sunlight and heat.

The mission design also leaves room for the observing instruments to operate for a few years, rather than a few months.

What Makes Venus So Difficult to Explore?

Venus is difficult to explore because of its crushing pressure, high temperature, acidic clouds and permanent cloud cover, which make surface exploration extremely hard and limit optical observation from orbit. The Venusian surface is hot enough to melt lead, and the pressure at the surface is similar to that found about a kilometre under Earth’s oceans.

Shukrayaan avoids the harshest conditions by staying in orbit, but it still faces other challenges:

• Clouds hide the surface from cameras, so radar or infrared methods are needed.
• Sulphuric acid droplets can degrade materials at lower altitudes, which matters when aerobraking dips the spacecraft into the upper atmosphere.
• The planet’s slow retrograde rotation, taking about 243 Earth days, and its year of about 225 Earth days, create unusual observing geometry.
• The communications delay and the distance require spacecraft autonomy and careful ground planning.
• Missions designed for Venus have historically had high failure rates, and mission planners must manage this risk.

What Did Earlier Missions Learn About Venus?

Earlier missions showed that Venus has a dense carbon dioxide atmosphere, a scorching surface and a landscape shaped by volcanism, and they set the scientific context that Shukrayaan will extend. Exploration of Venus began in the early 1960s and was led for years by the Soviet Union and the United States.

In 2020, researchers reported a possible detection of phosphine in the Venusian clouds, which sparked debate about whether it could indicate unusual chemistry or even life. The result was disputed by other teams, and the question remains unresolved. This episode renewed interest in Venus and in missions that can sample its atmosphere. Other agencies have planned new Venus missions for the 2030s, which could allow Shukrayaan to contribute to a wider period of observations.

How Does Shukrayaan Fit After Chandrayaan and Mangalyaan?

Shukrayaan fits after Chandrayaan and Mangalyaan as the next step in India’s progression from lunar and Martian missions to broader planetary science, using lessons from both. Each earlier mission expanded ISRO’s capabilities and public profile.

• Chandrayaan-1 (2008): India’s first lunar mission, whose instruments contributed to the detection of water molecules on the lunar surface.
• Mars Orbiter Mission, or Mangalyaan (2013-2014): launched in November 2013 and reached Mars orbit in September 2014, making India the first Asian country to enter Mars orbit and the first country in the world to do so on its first attempt.
• Chandrayaan-2 (2019): an orbiter, lander and rover mission whose lander did not complete a soft landing, though the orbiter continued to operate.
• Chandrayaan-3 (2023): India’s lander touched down near the Moon’s south polar region in August 2023, making India the fourth country to soft-land on the Moon.
• Aditya-L1 (launched 2023): India’s solar observatory placed near the Sun-Earth L1 point.

From Mangalyaan, ISRO has experience with deep-space navigation and long-term operation of an interplanetary orbiter. From Aditya-L1, the organisation has solar and plasma science expertise that applies directly to the solar interaction goals of Shukrayaan. From Chandrayaan, ISRO gained landing technology that is not needed for the Venus orbiter but is relevant to future missions.

It is also worth separating Shukrayaan from other major programmes. Gaganyaan is India’s human spaceflight programme, and the Bharatiya Antariksh Station is a planned space station. Shukrayaan belongs to the science and planetary exploration track.

What Are the Approval, Cost and Timeline of Shukrayaan?

The Union Cabinet approved Shukrayaan in September 2024 with an outlay of roughly Rs 1,200 crore, covering the spacecraft, the launch vehicle and associated costs. The mission is expected to be launched later this decade, with the Earth-Venus window of around March 2028 being the one ISRO has indicated.

The timeline for any deep-space mission can shift. Launch windows for Venus come only every 19 months, so a delay in spacecraft readiness can push the launch back by more than a year. Development involves building and testing instruments, integrating them with the spacecraft, and rehearsing orbit insertion. Because of this, it is wise to treat the target dates as plans rather than certainties.

The mission is also meant to involve Indian academic institutions, national laboratories and industry. Scientists from universities and research institutes are expected to take part in building instruments and analysing data, which supports India’s goal of strengthening domestic space science.

What Could Shukrayaan Reveal and Why Does It Matter?

Shukrayaan could reveal whether Venus is still volcanically and tectonically active, how its atmosphere circulates and how solar activity strips away its upper atmosphere, and it matters because these answers help explain how rocky planets become habitable or uninhabitable. The results would add to Earth-climate science and to the study of planets around other stars.

If the radar images detect fresh lava flows or surface changes, it would support the view that Venus is geologically active today. If the atmospheric measurements track sulphur chemistry and clouds in detail, it would improve climate models of runaway greenhouse conditions. If the plasma instruments measure how fast charged particles escape, scientists can estimate how much water the planet may have lost.

The mission also has strategic and educational significance. It demonstrates that India can plan and operate a complex deep-space mission beyond the Moon and Mars, and it offers students and young scientists a long-term research opportunity.

Bottom Line

Shukrayaan is an approved but still-to-fly ISRO orbiter designed to study Venus’s surface, clouds and solar interactions, led by a synthetic aperture radar. It extends the path that began with Chandrayaan and Mangalyaan, and it will test India’s ability to run complex planetary science. Its schedule depends on development progress and the next suitable launch window.

Frequently Asked Questions

What is Shukrayaan?

Shukrayaan is ISRO’s planned Venus Orbiter Mission, also called Shukrayaan-1, designed to study Venus from orbit. The Union Cabinet approved it in September 2024. The name comes from the Sanskrit word Shukra, meaning Venus, and yaan, meaning craft.

When will Shukrayaan be launched?

Shukrayaan is planned for launch later this decade, with a Venus launch window around March 2028 indicated by ISRO. The date is a target and could change with development progress. Venus launch windows occur roughly every 19 months, so a delay can push the launch back considerably.

Will Shukrayaan land on Venus?

Shukrayaan will not land on Venus because it is designed as an orbiter. The surface temperature is around 460 to 470 degrees Celsius and the pressure is about 90 times that of Earth, which would destroy most landers within hours. The orbiter will study the surface using radar from space.

What instruments will Shukrayaan carry?

Shukrayaan is planned to carry a synthetic aperture radar plus instruments for atmospheric composition, cloud structure, plasma and solar-wind interaction. The radar can image the surface through the clouds. The final instrument list is subject to ISRO’s design and review.

Why is Venus important to study?

Venus is important to study because it is similar to Earth in size yet has a runaway greenhouse atmosphere and a very hot surface. Understanding how Venus changed helps scientists model climate, planetary evolution and the habitability of Earth-sized planets around other stars. It also remains an under-explored world compared with Mars.

How is Shukrayaan different from Chandrayaan and Mangalyaan?

Shukrayaan targets Venus, while Chandrayaan targeted the Moon and Mangalyaan, the Mars Orbiter Mission, targeted Mars. Shukrayaan is an orbiter, like Mangalyaan, and will not carry a lander or rover as Chandrayaan-2 and Chandrayaan-3 did. It focuses on atmospheric, surface and solar-interaction science.

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