An unmanned aircraft that can travel at a breakneck pace 20 times the speed of sound will take off Wednesday from an Air Force base in California for a test flight. The second flight of the Hypersonic ...

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The mystery of dark matter—unseen, pervasive, and essential in standard cosmology—has loomed over physics for decades. In new research, I explore a different possibility: Rather than postulating new ...

When the 16th Amendment to the U.S. Constitution was ratified in 1913, it legalized the use of a graduated income tax system for the federal government. Today, many but not all states have legalized a ...

A Trump ‘Blockade’ Is Stalling Hundreds of Wind and Solar Projects Federal agencies are delaying approvals for renewable energy projects on both federal and private land even as demand for electricity ...

The Sun welcomes comments from readers via letters to the editor. All comments become the property of The Sun, which reserves the right to edit them. To submit a letter to the editor, use the form ...

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