Alexander, William.  Ambassador.
Appointed Earth's ambassador to the universe, twelve-year-old Gabe Fuentes discovers the Earth is in the path of a destructive alien force causing multiple mass extinctions. Grades 4-7  J-SF ALE

Bransford, Nathan.  Jacob Wonderbar and the Cosmic Space Kapow.
Prankster Jacob and his best friends, Sarah and Dexter, encounter an alien wandering in the woods and trade corn dogs for a chance to fly his spaceship.  Grades 4-7  J-SF BRA

Cameron, Eleanor.  Stowaway to the Mushroom Planet.
On their second flight to the planet Basidium, two boys find that they have a would-be scientist as a stowaway.  Grades 3-4  J-SF CAM

Cottrell Boyce, Frank.  Cosmic.
Liam Digby is so unusually tall that people think he should act like an adult, which leads him to compete against adults for a chance to go into space. Grades 5-9 J-SF COT

Fagan, Deva. Circus Galacticus.
Always impulsive orphan Trix, charity student at an elite boarding school, is offered a chance by a mysterious young Ringmaster to join an outer-space circus. Grades 5-8 

Fry, Jason.  Hunt for the Hydra.
Tycho and his family are privateers, plundering Earth cargo ships in Jovian space while uncovering a conspiracy that could jeopardize their livelihood. Grades 4-6 J-SF FRY

Gibbs, Stuart.  Space Case:  A Moon Base Alpha Novel.
Dashiell Gibson, who lives on Moon Base Alpha, has to solve a murder of one of the moon's most prominent doctors.  Grades 3-6  J-SF GIB

Kelly, Mark.  Astrotwins:  Project Blastoff.
Twins Mark and Scott Kelly decide to build a rocket over the summer when their constant bickering starts to annoy their grandfather in this middle-grade novel based on the NASA astronauts' real childhoods. Grades 3-6  J-HF KEL

Liss, David.  Randoms.
A twelve-year-old boy is chosen to join a four-person applicant team to work towards membership in the Confederation of United Planets, and stumbles across conspiracies resembling science fiction he's been a fan of his entire life. Grades 4-7 J-SF LIS

Mass, Wendy.  Pi in the Sky.
Earth is ripped out of the space-time continuum after earthling Annika discovers The Realms through her telescope, Joss (7th son of the Supreme Overlord of the Universe) must re-create Earth. Grades 3-6 J-SF MAS

McDougall, Sophia. Mars Evacuees.
When Earth comes under attack by aliens, Alice Dare and a select group of kids are sent to Mars. Then the adults disappear. Grades 4-7 J-SF MCD

McHale, D.J.  Project Alpha.
Eight boys and girls compete for a spot on the space voyage that will search for a source to solve Earth's energy crisis. Grades 4-7 J-SF MCH

Nylund, Eric.  The Resisters.
Kidnapped, Ethan learns that the Earth has been taken over by aliens and that all the adults in the world are under mind control. Grades 5-7  J-SF NYL

O’Donnell, Tom.  Space Rocks.
This story of life on an asteroid, told from point of view of the five-eyed Chorkle, takes a wild turn to adventure when the hair-headed "humans" arrive to mine iridium.  Grades 4-7  J-SF ODO

Paton Walsh, Jill.  The Green Book.
As their supplies dwindle, a group of refugees from Earth struggle to make their strange new planet habitable.  Grades 5-6 J—SF PAT

Reeve, Philip.  Starcross.
Young Arthur Mumby, his sister Myrtle, and their mother accept an invitation to take a holiday at an up-and-coming resort in the asteroid belt, where they become involved in a dastardly plot involving spies, time travel, and mind-altering clothing. Grades 5-9 

Schmidt, Gary D.   What Came from the Stars.
On a distant planet, the besieged Valorim send a necklace containing their planet to Earth in a last-ditch effort to save their civilization. Tommy Pepper, a sixth-grader living in Plymouth, Mass., finds the necklace, wears it and is gradually changed by it.  Grades 5-8  J-SF SCH

Tesler, Monica.  Bounders.
Jasper and his friends are the first astronaut cadets who use new spaceships to teleport, but soon are forced to go up against an alien society seeking revenge for stealing this technology. Grades 5-9  J-SF TES

Yaccarino, Dan.  Delivery of Doom.
Young Luno is finally getting a chance to make deliveries for his family's intergalactic pizza business.  But beware: there are plenty of inhospitable customers (and planets) out there.  Grades 3-6  J-SF YAC