Rocket Science: A Beginner’s Guide to the Fundamentals of Spaceflight

Sometimes it takes a rocket scientist to offer young readers the most engaging introduction to space travel, the solar system, and the universe.

Earth’s gravity keeps our feet on the ground, and also prevents us from soaring into space. So how do we explore that vast frontier? We use rockets! Discover how rockets work—from staging to orbits to power generation, from thermal control to navigation and more. Learn how rockets and other spacecraft travel to and explore the moon, Mars, Jupiter, and beyond. Speculate about the future of space exploration—and the possibility of extraterrestrial life. In a guide ideal for aspiring rocket engineers, planetary scientists, and others who love learning about space exploration, Galen Frazer’s distinctive yet accessible illustrations pair perfectly with Andrew Rader’s straightforward text, together taking readers to the edge of our knowledge of space travel.

Standard and Primary covers are widely available through general retailers. They often have higher print runs and can be cheaper, especially during sales.

In contrast, Direct Market (DM) and variant covers are primarily sold in comic shops. DM editions tend to have more limited availability and may be more valuable to collectors.

The main differences lie in artwork style, availability, price, and collector appeal. Ultimately, the choice between standard and variant covers depends on personal preference, budget, and individual collecting goals.

Comic book enthusiasts have various formats to choose from when collecting their favorite stories.
Here's a brief overview of the main types:

Omnibus

• Large, hardcover collections
• Usually contain complete runs or extensive story arcs
• Typically 800-1000+ pages
• Higher price point, often €100-€150

Oversized Hardcover (OHC)

• Similar dimensions to omnibus, but thinner
• Collect shorter runs or story arcs
• Usually 300-600 pages
• Priced between €30-€50

Hardcover (HC)

• Standard-sized hardcover books
• Collect 6-12 issues typically
• Similar dimensions to single issues, but with a hard cover
• Priced around €25-€35

Trade Paperback (TP)

• Softcover collections
• Standard comic book size
• Usually collect 4-6 issues
• Most affordable option, typically €15-€25

Other Formats

• Absolute Editions: Oversized, deluxe hardcovers (mainly DC Comics)
• Compendiums: Massive paperback collections
• Graphic Novels (OGN/GN): Original stories not previously released as single issues

The choice between these formats often depends on personal preference, budget, and collecting goals. Omnibus and OHC editions offer larger artwork and more content but at a higher price, while TPs provide a more affordable way to collect complete story arcs