"Reusability and in-orbit docking are the twin pillars of India's next-phase space ambitions." Examine this with reference to RLV, NGLV and SpaDeX.

India's next phase includes the Bharatiya Antariksh Station (BAS), a lunar sample return and a US$44 billion space economy by 2033 [6]. This rests on two abilities. Reusability makes reaching orbit cheaper and repeatable. Docking lets spacecraft be joined in orbit. India has demonstrated both, but neither is in regular use yet.

Pillar 1: Reusability – cheaper access to orbit

• RLV (Pushpak): LEX-03 (June 2024) made an autonomous runway landing after release 500 m off-axis, touching down above 320 km/h. It reused the same winged body and systems flown in LEX-02 [2].
• NGLV: Approved in September 2024 at ₹8,240 crore. It can carry 30 t to LEO and has a reusable first stage. That is three times LVM3's payload at 1.5 times its cost [1].
• Impact: Lower cost per kg makes Indian launches more competitive commercially. It also provides the heavy lift needed to put station modules in orbit.

Pillar 2: Docking – building missions in orbit

• SpaDeX (PSLV-C60): The chaser SDX01 and target SDX02 showed rendezvous, docking and undocking [3]. India became the fourth country to dock spacecraft in space [6].
• The second docking (April 2025) was fully autonomous from 15 m. The two craft also transferred power in both directions [4].
• Impact: Docking makes possible BAS, a five-module station with BAS-01 due by 2028 [5]. It also allows missions that need several launches, such as Chandrayaan-4 sample return [3].

Why they are "twin" pillars

NGLV/RLV (heavy, low-cost lift) → modules in LEO → SpaDeX-type docking → BAS / Chandrayaan-4

Reusability lifts the mass into orbit. Docking puts it together. Neither is enough alone.

Gaps that remain

• RLV has tested only landing. Orbital re-entry has not yet been flown [2].
• NGLV's approval covers only three developmental flights, with an 8-year development target [1]. Its cost advantage is still a forecast.
• SpaDeX used small craft of about 220 kg [3], and the first docking needed a manual hold at 3 m [4]. Joining heavy station modules is a much bigger step.

Reusability and docking work together: one makes access to orbit affordable, the other makes complex missions possible. To turn demonstrations into reliable capability, India needs an orbital RLV re-entry test and more NGLV launches after the test flights. It also needs follow-on docking missions with heavier spacecraft. If these stay on schedule, the two pillars can support BAS and a self-reliant (Atmanirbhar) Indian space programme.