Right Ascension. Edge of Apocalypse, #1

Set in the year 3040, Right Ascension explores mankind's place in the Universe, how we ascended to that lofty position, and the horrifying price of that ascension.* * * * *Humanity's struggle to assume a place of dominance within the galaxy is suddenly called into question when a sleek alien vessel arrives unexpectedly at Earth. Admiral Daniel Atgard and the crew of the Apocalypse embark on a mission to find these enigmatic aliens, but the focus of the mission quickly turns from finding answers to exacting revenge.
Meanwhile, a belligerent species of reptilian warriors, seeking to avenge a previous defeat at the hands of the human-controlled United Confederation of Planets, takes this opportunity to plan an all-out assault on Earth. Faced with overwhelming odds and the terrible knowledge of humanity's most horrifying secret, Daniel must choose between honor... and humanity's very survival.