Help Shape the Future of Space Exploration

Join The Planetary Society Now  arrow.png

Join our eNewsletter for updates & action alerts

    Please leave this field empty

Space Topics

Section Highlights

Space Missions

News and facts about the space missions that explore our solar system.

More »

Compare the Planets

Comparing the physical characteristics of the planets and other things in our solar system (and beyond)

More »

Space Imaging

Most deep-space missions carry cameras to acquire scientific data; but these data can also be used to produce stunning views of distant worlds. And almost all of this data is free and readily available to the public for download.

More »

Citizen Science

Citizen Science projects harness the efforts of thousands of space enthusiasts to amass data sets that no single scientist could ever produce.

More »

Our Sun

The Sun is a variable star with an 11-year cycle of storm and quiet activity.

More »


Planet Mercury orbits closest to the Sun, and has had only two visitors: MESSENGER and Mariner 10.

More »


It's our nearest neighbor and a near twin to Earth in size and composition. But, compared to the rest of the terrestrial worlds, we know little about Venus.

More »

Our Moon

The Moon, destination of the Apollo program, now the proving ground for a new generation of space-faring nations.

More »


Science of Mars and its exploration by orbiters and rovers Curiosity and Opportunity

More »

Asteroids and Comets

Asteroids in the main belt or near Earth; comets in the Kuiper belt or visiting the Sun; near-Earth objects and the impact hazard they represent

More »

Outer Planets

Outer Planets Jupiter, Saturn, Uranus, and Neptune have retinues of moons and rings that make them like mini-solar systems.

More »

Pluto's Neighborhood

Pluto's Neighborhood: Kuiper Belt, Dwarf Planets, Centaurs, and Sedna

More »

Extrasolar Planets

Extrasolar planets being discovered by Kepler and the world's great telescopes

More »

Life in the Universe

Could humans be the only intelligent beings in all the vastness of the universe? Or are we just one humble race, a member of a vast intergalactic fraternity of advanced civilizations? Is there other life in the solar system, or are we alone?

More »

Facebook Twitter Email RSS AddThis

Planetary Defense

An asteroid or comet headed for Earth is the only large-scale natural disaster we can prevent. Working together to fund our Shoemaker NEO Grants for astronomers, we can help save the world.



Beyond The Horizon, There's More To Explore!

Become a member of The Planetary Society and together we will create the future of space exploration.

Join Us

Space in Images

Pretty pictures and
awe-inspiring science.

See More

Join The Planetary Society

Let’s explore the cosmos together!

Become a Member

Connect With Us

Facebook, Twitter, YouTube and more…
Continue the conversation with our online community!