"A landmark feat in space exploration as NASA's aptly named spaceship sends back data & photos of Pluto from almost 5 billion kilometres away," he tweeted.
"Congratulations to @NASA team. Their efforts will provide rich insights to enhance our understanding of our solar system," Modi added.
He was commenting on NASA's New Horizons spacecraft getting humanity's first up-close look at Pluto.
The signal received back home in the US confirms the probe has sailed pass its target successfully and it is now set to transmit a wealth of data - including several new high resolution images from Pluto. Pluto is the first Kuiper Belt object visited by a mission from Earth.