Iran's Supreme Leader Ayatollah Ali Khamenei on Wednesday said Iran should further strengthen its military power, including ...

Supreme Leader Ayatollah Ali Khamenei said on Wednesday Iran should further develop its military, including its missiles, ...

Stricter fuel efficiency standards and policies are needed to drive further reductions in aircraft fuel burn, especially for ...

NASA's X-59 quiet supersonic research aircraft has taken another successful step toward flight with the conclusion of a series of engine performance tests.

While this latest test doesn’t make nuclear-powered rocket engines viable just yet, it’s an important step on the journey.

Astronomers have discovered a massive, double-lobed radio jet stretching 200,000 light-years from a quasar that existed when ...

The U.S. government wants to select "disparate" locations where it could eventually make bomb-grade uranium again.

Russia's United Aircraft states that 11 serial-production Yakovlev SJ-100 airframes have been assembled, and will be ...

Ukraine destroyed a Russian fighter jet and then ambushed a rescue helicopter trying to pluck the pilot to safety, it has ...

"Today, our defensive power is well-known. Our enemies are afraid of this. This is very important for our country," Khamenei said.

From decades of astronomical observations, scientists know that most galaxies contain massive black holes at their centers.