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One of the largest black holes ever recorded has been discovered using a new technique that could spot thousands more of the insatiable celestial monsters in the coming years, according to astronomers.

The ultra-massive black hole, one of just four ever observed, is more than 30 billion times the mass of the Sun, a new study said.

It is the first black hole ever observed using a phenomenon called gravitational lensing, in which light travelling towards us from a distant galaxy appears to magnify and bend inwards, giving away the presence of a dark giant.

The construction of the railway line on the 6.15-km Padma bridge has been completed, reports UNB.  Md Afzal Hossain, director of the Padma Bridge Rail Link Project, made the announcement on Wednesday afternoon.

“We’ll conduct a trial run on the 41-km railway from Bhanga to Mawa on 4 April,” Afzal Hossain told the newspersons.