Technic

Planet Earth and Moon in Orbit

42179
526 pieces
Retiring End of this year
BUYING ADVICE
✅Good deal
10% OFF
A solid 10% discount. This is a good deal based on this set's typical pricing. Retiring within 3 months, so stock is dwindling and deals can vanish fast.

retail price

$74.99

 

best price

$67.49

-$7.50

Lowest ever: $61.99 at Target (11 Jul 2026)

This set is 10% off - watch it to get notified of even bigger drops

About LEGO Planet Earth and Moon in Orbit

This 526-piece building toy recreates the Earth, Sun and Moon system as a working mechanical model. The finished construction measures 33 cm long, 24 cm high and 18 cm wide, creating a substantial display piece that demonstrates planetary motion through hands-on interaction.

The model features a hand-operated crank mechanism that drives the orbital motion. Turning the crank shows how Earth and the Moon travel around the Sun, with the Moon simultaneously orbiting Earth. The model includes detailed month indicators and moon phase displays, helping to illustrate how Earth's position in its orbit creates seasonal changes throughout the year.

Educational Features

The set incorporates scientific accuracy alongside mechanical function. Month markers around the Sun's orbit correspond to Earth's position, while the Moon phases change as the satellite completes its cycle. This provides a tangible way to understand astronomical concepts that are often difficult to visualise from textbooks alone.

Designed for builders aged 10 and up, the model combines LEGO Technic building techniques with space science education. The mechanical elements require some technical building skills while delivering an engaging result that demonstrates real astronomical principles through physical interaction.

Where to Buy LEGO Planet Earth and Moon in Orbit for the Best Price

We've been tracking prices for this set since July 2026. The recommended retail price is $74.99. It's currently available from 4 retailers, with Staples offering the best price at $67.49, which is 10% below RRP. The lowest price we've ever recorded was $61.99 at Target in July 2026, 17% off RRP. Over its tracked history, prices have ranged from $61.99 to $74.99. This set is expected to retire end of this year, so prices may increase as availability decreases.

Set Details

Set Number
42179
Pieces
526
Theme
Technic
RRP
$74.99
Best Price
$67.49
Price per Piece
0.13p
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Price History

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Price History

Staples
08/11/2026
$67.49
Amazon US
06/11/2026
$74.99
Barnes & Noble
07/10/2026
$74.99
LEGO
04/08/2026
$74.99