For my last day lets look at our neighbor - planet Mars. (planetpailly.com) 
With a radius of 3,390 kilometers, Mars is about half the size of Earth. (NASA)
Mars has two moons, Phobos and Deimos. They're potato-shaped because they have too little mass for gravity to make them spherical.
Mars has a thin atmosphere made up mostly of carbon dioxide, nitrogen and argon gases.
Winds on Mars sometimes get strong enough to create dust storms that cover much of the planet. After such storms, it can be months before all of the dust settles. Image below shows change in the planet's appearance when haze is raised by dust storm. (NASA/JPL-Caltech/MSSS)
Mars is home to the largest volcano in the solar system, Olympus Mons. It's three times taller than Earth's Mt. Everest.
No planet beyond Earth has been explored as much as Mars. Today, a fleet of robotic spacecrafts are studying Mars from all angles. In the orbit around Mars we have Mars Reconnaissance Orbiter which collects and relays daily science and weather data since 2006. (NASA/JPL-Caltech)
Mars Odyssey has been in orbit since 2001 and its main mission is to investigate the Martian environment and to provide key information on hazards that future explorers might face. (NASA)
For the last 6 years MAVEN has been orbiting Mars studying the structure and composition of the upper atmosphere of the planet. (NASA)
Mars Express studies martian atmosphere and climate, the planet's structure, its mineralogy and its geology, and searches for traces of water from orbit. (ESA)
The Indian Space Research Organisation’s first interplanetary mission, MOM (Mars Orbiter Mission) studies Martian topography, morphology, mineralogy, and atmosphere. MOM's orbit also allows observation of the Martian moon Phobos. (ISRO)
Final spacecraft in orbit around Mars is ExoMars Trace Gas Orbiter. A key goal of this mission is to gain a better understanding of methane and other atmospheric gases that are present in small concentrations (less than 1% of the atmosphere). (ESA)
On the surface of Mars NASA's InSight, a stationary lander, is probing Mars' interior on a flat smooth plain called Elysium Planitia. InSight is investigating Martian tectonic activity and meteorite impacts. (NASA/Jet Propulsion Laboratory-Caltech)
And then there is Curiosity rover studying the ancient habitability and the potential for life on Mars since 2012.
On its way to Mars (at the moment) is Perseverance Rover. It will search for signs of ancient microbial life at Jezero crater.
In ~2022 third rover is expected to land on Mars. ExoMars robotic explorer, named Rosalind Franklin.
So this is some info about Mars. With all exciting new missions there is no doubt our knowledge will only keep expanding.
