Sun-Earth Days 2014

National Aeronautics and Space Administration

Goddard Space Flight Center

Sun-Earth Days 2014

Small Worlds Week

Small Worlds Week

On May 2nd through the 6th, 2016, Planetary Scientists will partner with the Sun-Earth Day team to bring you the latest information and science about our solar system's smallest planets, Mercury and Mars! Then on Friday, May 6th, our small worlds experts will be online to answer your questions.

Join the fun on Friday, May 6th! From noon to 4pm (EDT), our planetary scientists will be online to answer your questions through Facebook or Twitter (#NASASWW). We'll be collecting your questions until then, so send them in now!

Submit your questions now on Facebook and Twitter.

Daily Activity Plan

Monday - Mercury

Monday - Mercury

Only slightly larger than Earth's moon, Mercury is the smallest planet, even smaller than Jupiter's moon, Ganymede...

Tuesday - Mercury Transit

Tuesday - Mercury Transit

Asteroids, also called "minor planets" or "planetoids" are small, rocky, airless worlds left over from the formation of planets...

Wednesday - Mars at Opposition

Wednesday - Mars at Opposition

In the depths of the dark, frigid outer solar system, sub surface oceans have been confirmed within many of the moons of...

Thursday - Mars Observing Campaign

Thursday - Mars Observing Campaign

Small, icy worlds, orbiting largely outside the orbit of Neptune, in highly elliptical orbits....

NASA Fact

A major solar 'superstorm' such as the one in 1859 could cost $30 billion a day to the US electrical power grid, and up to $70 billion to the satellite industry.