This rogue star has been traveling the Universe. And now, it's finally entering our Solar System. But this isn't just any regular star. It's known as a quasi-star and is one of the biggest stars in ...

Astronomers are closing in on one of the most tantalizing possibilities in planetary science, evidence that a previously unknown world may be lurking in the outer reaches of the solar system. The ...

The price of residential solar has dropped 64% over the past decade due in large part to falling hardware costs. What would have cost $30,000 or more for a standard 10-kilowatt system in the early ...

Voyager 1, launched in 1977, has traveled farther than any spacecraft in human history. After more than four decades of silent endurance through space, it now sails beyond the orbit of the outer ...

Illustration comparing the planets of the Solar System and the Sun on the same scale. The planets are shown to scale relative to each other but their distances are not. From left to right the bodies ...

Forbes contributors publish independent expert analyses and insights. Dianne Plummer is an Energy Consultant and Certified Energy Manager. Rooftop solar has become one of the fastest-growing clean ...