Scientists estimate invasive insects will kill 1.4 million US street trees by 2050

What's it like inside a massive galaxy cluster? Scientists used 196 lasers to find out.

According to a US Auditor, Each Launch of the Space Launch System Will Cost an “Unsustainable” $4.1 Billion

Astronaut Peggy Whitson says Russia's invasion should lead to more engine development in the US: 'We rely on Russian engines a bit more than we should.'