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Millions of butterflies, including blue tigers, dark blue tigers and crow butterflies, are migrating from the Eastern Ghats towards the Western Ghats during the onset of the Northeast monsoon in October 2026. The movement across Tamil Nadu is linked to the seasonal rains and the availability of host plants in forests of the Western Ghats.

Vummidi Ethiraj, a jeweller who played a key role in crafting the Sengol, died in Chennai on 21 October 2026 at the age of 99. Born on 25 November 1926, he was the patriarch of the Vummidi family, which owns Vummidi Bangaru Jewellers, a 125-year-old jewellery business.

ISRO announced on 22 October 2026 that it plans to launch NVS-03 on 30 October 2026. The indigenous navigation satellite will lift off from the Satish Dhawan Space Centre at Sriharikota aboard a GSLV Mk II rocket.

The Tuticorin International Container Terminal (TICT) at VO Chidambaranar Port (VOC Port), Tamil Nadu, was designated a green terminal on 22 October 2026 after all its operational equipment was electrified. The Union Shipping Secretary made the designation during a review of port projects. VOC Port has an annual cargo-handling capacity of 82 million tonnes per annum (MTPA).

On 22 October 2026, the Pentagon authorised the Department of Homeland Security (DHS) to test an Active Denial System (ADS) for possible use along the US–Mexico border. A memo signed by US Defense Secretary Pete Hegseth in September 2026 permits DHS to borrow one unit for seven months, starting in September.

Kashi Tamil Sangamam 5.0 to Focus on Thirukkural

The fifth edition of Kashi Tamil Sangamam (KTS 5.0) is scheduled from November 28 to December 12, 2026. Its theme, “Thirukkural Payilvom – Thirukkural Abhyas Karen”, means “Let’s Learn Thirukkural” and focuses on the ethical and moral values of the classical Tamil text.

Erhaia dijiang is a newly described freshwater cave snail found in Yuxi City, Yunnan Province, China. Published in the journal Subterranean Biology in 2026, it is the first freshwater cave snail documented in China. The species was found at an elevation of 2,062 metres, the highest recorded for a cave snail in the family Erhaiidae.

Centaurus X-3 is a high-mass X-ray binary containing a highly magnetised neutron star and a companion star with more than ten times the Sun’s mass. Located about 24,000 light-years away in the constellation Centaurus, it is among the brightest X-ray pulsars. In October 2026, researchers at the Raman Research Institute (RRI), Bengaluru, led by Kinjal Roy, reported findings on its accretion dynamics.