Why is Mars so small?

Why is Mars so small?

J’onn J’onzz needs astronomers’ help figuring out why his home planet of Mars is smaller (and hence, less habitable) than the Earth. He already asked the rest of the Justice League, but they could not solve the problem. Can Drążkowska et al. save the day?

Why is Mercury so far from the Sun?

Why is Mercury so far from the Sun?

Roughly half of all planetary systems have planets much closer to their stars than Mercury is to our Sun. Can a system’s magnetic field during the stage of planet formation explain why half of all systems (including our own) do not have these planets when the other half do?

A newfound moon in the Solar System

A newfound moon in the Solar System

There’s so much to see in the Universe that we can forget there are still things to discover in our own neighborhood. The authors of today’s paper decided to search the Solar System a bit further, and made a very interesting discovery around the dwarf planet Makemake.

Planet IX

Planet IX

Get ready to come up with a new mnemonic for the planets. The orbits of distant objects suggest that there may be something lurking in the outer Solar System as big as Neptune!