US-India NISAR satellite spots 'hummingbird' in Antarctica

The NISAR satellite, a joint venture between NASA and the Indian Space Research Organisation (ISRO), has released its first batch of L-band radar data. Among the images is a striking pattern from Antarctica that resembles a giant hummingbird.

The shape, captured by the satellite's powerful radar, has sparked curiosity online. But scientists are clear: it is not a bird. It is a natural geological formation, carved by ice and wind over millennia.

What the 'hummingbird' really is

The 'hummingbird' is a radar image of a subglacial feature in Antarctica. The L-band radar can penetrate ice and surface debris, revealing contours hidden from optical cameras.

The shape is likely a nunatak — a rock peak protruding through the ice — or a pattern in the bedrock. The radar highlights elevation changes, creating the illusion of a bird in flight.

Officials at NASA and ISRO have not yet confirmed the exact geological nature of the feature. But they stress that it is a natural phenomenon, not an anomaly.

NISAR's mission and data release

NISAR stands for NASA-ISRO Synthetic Aperture Radar. The satellite was launched to monitor Earth's surface changes with unprecedented precision. It uses both L-band and S-band radar systems.

The L-band data released this week is the first public dataset from the mission. It covers regions including Antarctica, the Himalayas, and parts of the Amazon rainforest.

The data will allow scientists to track movements of glaciers, ice sheets, and land surfaces down to centimetres. It can also monitor deforestation, earthquake zones, and volcanic activity.

For India, the data is crucial for studying the Himalayan glaciers and their response to climate change. For the US, it helps monitor polar ice loss and sea level rise.

Why L-band radar matters

L-band radar has a longer wavelength than other radar types. This allows it to penetrate vegetation, dry snow, and loose soil. It can see through clouds and darkness, making it ideal for polar and tropical regions.

In Antarctica, the radar can map the shape of the ice sheet base, revealing hidden valleys and mountains. The 'hummingbird' image is a striking example of this capability.

Scientists will use the data to improve models of ice flow and predict future ice loss. The NISAR mission is expected to operate for at least three years, providing a continuous record of change.

The next data release is likely to include S-band radar images, which are better at mapping vegetation and urban areas. Together, the two bands will give a comprehensive view of Earth's surface dynamics.

What to watch for: As more data becomes available, researchers will release detailed studies of the 'hummingbird' and other features. The mission's ability to track rapid changes in ice sheets and forests will be a key focus in the coming months.