There's a new moon on the horizon. The Earth will gain a second, mini-moon on Sept. 29, but it won't stick around too long, USA TODAY reports. The asteroid 2024 PT5 is expected to escape Earth's orbit ...

Add Yahoo as a preferred source to see more of our stories on Google. Earth partially illuminated, displaying continents and clouds, floating in dark space scattered with distant stars. …and sometimes ...

We tend to think of Earth as a well-documented planet. We've mapped its continents, sampled its oceans, drilled into its ...