Death Wave (Star Quest Trilogy 1)

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Six-time Hugo Award winner Ben Bova chronicles the saga of humankind's expansion beyond the solar system in Death Wave
In the precursor to the Star Quest Trilogy, New Earth, Jordan Kell led the first human mission beyond the solar system. They discovered the ruins of an ancient alien civilization. But one alien AI survived, and it revealed to Jordan Kell that an explosion in the black hole at the heart of the Milky Way galaxy has created a wave of deadly radiation, expanding out from the core toward Earth. Unless the human race acts to save itself, all life on Earth will be wiped out.
When Kell and his team return to Earth, many years after their departure, they find that their world has changed almost beyond recognition. Not only has a second wave of greenhouse flooding caused sea levels to rise, but society has been changed by the consequences of the climate shift. Few people want to face Jordan Kell's news.