The SALT telescope near Cape Town has used its powerful spectroscopy light measurement tool to prove the existence of the white dwarf pulsar.
Scores of people are feared trapped after a six-storey building collapsed in the Kenyan capital following flooding.

Zuma corruption decision reviewed

Prosecutors will review 2009 corruption charges against South African President Jacob Zuma, who is facing calls to resign even from within the ANC.
Sudanese students have mounted a rare demonstration in Khartoum after a man was shot dead at another protest a day earlier.
A cholera outbreak on the African island of Zanzibar has killed at least 45 people since March, a health official says.
Eleven people have been shot dead in Cape Verde including eight soldiers, a local civilian and two Spanish citizens, reports say.
Opposition leader Julius Malema is being investigated by South African police for "inflammatory" speech, as political tensions grow.
A safe haven for rhinos is to be created in Australia, as wildlife groups say South Africa is not doing enough to protect the endangered species.
At least eight refugees have died when two female suicide bombers attacked a Nigerian camp for those displaced by the jihadist Boko Haram insurgency.
At least 200 Somalians have drowned while trying to cross illegally into Europe, the Somalian government has confirmed.
South African Paralympian Oscar Pistorius, who will be sentenced in June for murdering his girlfriend, faces a minimum 15-year jail term.
The Ugandan DPP says he is withdrawing the charges of terrorism, murder and crimes against humanity against Australian cardiologist Aggrey Kiyingi.
Two years after the mass kidnapping of girls from a Nigerian school, 219 remain missing.
Thousands of Zimbabweans have marched through the capital Harare demanding that President Robert Mugabe step down.
Some of the Nigerian girls kidnapped two years ago by Islamic terrorists are said to be shown in a video aired by CNN.
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