Understanding phenomena of black holes in 'Black Hole Survival Guide'.

ABC News' Linsey Davis speaks with astrophysicist Janna Levin, author of "Black Hole Survival Guide," breaking down all the fundamentals of black holes and how they are seen in the universe.

Watch video on channel "ABC News"
Biden signs new $40B aid package for Ukraine

Biden signs new $40B aid package for Ukraine

ABC News foreign correspondent Tom Soufi Burridge discusses how President Joe Biden’s new aid package could help Ukraine in its fight against Russia.

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China responds to comments from Biden about Taiwan

China responds to comments from Biden about Taiwan

ABC News’ Britt Clennett discusses the high tensions between the United States and China during President Joe Biden’s Asia tour.

Title 42, Trump-era immigration policy, to remain in place.

Title 42, Trump-era immigration policy, to remain in place.

ABC News contributor Maria Elena Salinas discusses a federal judge blocking the Biden administration’s attempt to lift the Title 42 border policy.

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Biden says US would intervene militarily if China were to invade Taiwan.

Biden says US would intervene militarily if China were to invade Taiwan.

The White House clarified President Joe Biden’s statement on Taiwan, saying it is not changing long-standing policy and the U.S. would simply assist Taiwan in defending itself.

McDonald's to leave Russia

McDonald's to leave Russia

The company said it has initiated a process to sell its Russian business.