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On April 7, 2017, New Horizons entered a 157-day-long hibernation. New Horizons is an interplanetary space probe and is NASA’s first mission to Pluto and the Kuiper Belt. After operating steadily for almost two and a half years, the spacecraft and its systems deserve this much-needed break.

The Cassini spacecraft has spent almost 13 years exploring the beautiful giant planet Saturn and its amazingly diverse moons. Cassini’s mission will end in September when it plunges into Saturn’s atmosphere, but it will leave behind a wealth of knowledge and wonder.

It's 5 o'clock somewhere on Mars!

No human has ever set foot on Mars, but scientists have been working there for years. A day on the red planet is about 40 minutes longer than here on Earth, which wreaks havoc on your workweek.

At their core, planetary missions are about exploration, pure and simple. It’s hard to beat the excitement of discovering a new feature on the surface of a planet that’s being imaged by spacecraft for the first time. I had this experience many times during the MESSENGER mission.

Visitors to the newly renovated Boeing Milestones of Flight Hall may miss one particular satellite hanging amongst historical heavyweights such as the Ryan NYP Spirit of St. Louis and the Lunar Module LM-2. This object, however, with its distinctive blue solar panels deployed, is a full-scale engineering prototype of Mariner 2, the first spacecraft to radio useful scientific data from the vicinity of another planet, Venus.

Being a member of a science team of a planetary mission is like being a starter on a major league baseball team—you’re in the game. That’s how I felt as a member of the MESSENGER mission to Mercury. During the final months of MESSENGER’s time in orbit, before the fuel on the spacecraft was expended and crashed on Mercury’s surface, a decision had to be made—keep the spacecraft in its nominal mapping orbit as long as possible or let the spacecraft altitude drift lower to get as close to the planet as possible.

The annual Perseid meteor shower is at its peak (August 11-13). Meteor showers occur when the Earth’s orbit around the Sun takes us through a debris field, which is often a trail of cosmic dust left behind by a comet.

On this day in 2011, Juno began its journey to Jupiter. After an almost five-year journey, the spacecraft successfully entered Jupiter’s orbit, and has since been investigating the planet's origins, interior structure, deep atmosphere and magnetosphere.

On this day in 2007, the Mars Phoenix lander was launched from a Delta II at Cape Canaveral Air Force Station, Florida. Phoenix flew to a site in the far northern plains of Mars where it analyzed components of the surface, subsurface, and atmosphere.

As the National Air and Space Museum’s annual Mars Day! celebration approaches, we look to a recent research trip taken by a Smithsonian Summer Intern to investigate the similarities between some of Earth’s most amazing dunes and those found on the ruddy surface of Mars.