Add Yahoo as a preferred source to see more of our stories on Google. This video takes viewers on a long journey from the diminutive Speck of Horton Hears a Who (diameter 0.9 mm) all the way up to the ...

An animation posted to Twitter has shocked social media users by showing the impressive size of Jupiter and just how rapidly the solar system's largest planet rotates. The animation posted by ...

There’s something about comparing the sizes of unthinkably large objects that’s endlessly intriguing. Looking at a comparison of all the various sizes of stars in the universe, for example, makes for ...

Comparative sizes of planets discovered by Kepler. Jupiter, Neptune and Earth are shown for comparison as well. "RE" in the diagram means size relative to Earth or RE = Radius of the planet in Earth ...

After discovering scores of oddball planets around distant stars in recent years, astronomers have finally detected something that looks familiar: a family of planets that includes one roughly ...

Scientists have discovered over 4,000 exoplanets outside of our Solar System, according to NASA’s Exoplanet Archive. Some of these planets orbit multiple stars at the same time. Certain planets are so ...

This diagram shows the orbits of seven planets around the cool red dwarf star, TRAPPIST-1. The shaded area shows the star's "habitable zone," where a planet could have the right surface temperature ...

Determining the size of an Earth-size exoplanet by the amount of starlight it blocks hundreds of light-years away once was the realm of science fiction. Measuring the mass of such a small planet based ...