The exoplanet TRAPPIST-1 d intrigues astronomers looking for possibly habitable worlds beyond our solar system because it is ...

One such planet, known as exoplanet TRAPPIST-1 d, has intrigued astronomers looking for possibly habitable worlds beyond our solar system; it is similar in size to Earth, rocky, and resides in an area ...

A giant planet may be orbiting the nearest Sun-like star to Earth, and the discovery is sparking excitement across the ...

The views of Earth from the far stretches of space are some of the most incredible sights. From capturing weather patterns and the grand expanse of blue oceans below to the great continents that shape ...

A strange shift in Earth's rotation is making our days milliseconds shorter — and scientists are racing to understand why.

In six billion years the sun will expand into a red giant. That process should consume Mercury, and maybe Venus. For a long time we have thought it might incinerate Earth, too. But perhaps all is ...

A sleeping ultramassive black hole, 36 billion times the Sun’s mass, is warping light 5 billion light-years from Earth.

First off, space is cold, with the background temperature being an average of 2.7 Kelvin (−270.45°C or −454.8°F). And the Sun is indeed hot, in confusing ways.

While Venus passes between the Earth and Sun every 19.5 months, it's only about every eight or so years that the planet becomes visible both after sunset and before sunrise, according to the ...