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Portrait of the monster black hole at our galaxy’s heart

The monster black hole at our galaxy’s heart. The two year drought in East Africa. Questions around the death of the first xenotransplant patient. Growing plants in moon dust.

The heaviest thing in the Galaxy has now been imaged by the biggest telescope on Earth. This is Sagittarius A*, the supermassive black hole at the centre of our Galaxy – a gas and star-consuming object, a 4 million times the mass of the Sun. The Event Horizon Telescope is not one device but a consortium of radio telescopes ranging from the South Pole to the Arctic Circle. Their combined data allowed astronomers to focus in on this extreme object for the first time. Astronomer Ziri Younsi from University College London talks to Roland Pease about the orange doughnut image causing all the excitement.

Also in the programme…

Climatologist Chris Funk talks about the role of La Niña and climate change in the record-breaking two year drought that continues to threaten the lives and livelihoods of millions of people in East Africa.

Was a pig virus to blame for the death of the first patient to receive a pig heart transplant? We talk to the surgeon and scientist at the University of Maryland School of Medicine who led the historic animal to human transplant operation this year.

How easy will it be to grow plants in lunar soil on future moon bases? Plant biologist Anna Lisa Paul has been testing the question in her lab at the University of Florida, Gainesville, with cress seeds and lunar regolith collected by the Apollo missions.

Photo: First image of Sgr A*, the supermassive black hole at the centre of our galaxy
Credit: EHT Collaboration, Southern European Observatory

Presenter: Roland Pease
Producer: Andrew Luck-Baker

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29 minutes

Last on

Sun 15 May 2022 01:32GMT

Broadcasts

  • Thu 12 May 2022 19:32GMT
  • Fri 13 May 2022 03:32GMT
  • Fri 13 May 2022 04:32GMT
  • Fri 13 May 2022 08:32GMT
  • Fri 13 May 2022 12:32GMT
  • Fri 13 May 2022 19:32GMT
  • Sun 15 May 2022 01:32GMT

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