References

Test your knowledge on our solar system, from the biggest and smallest planets to the behemoth mountain on Mars.

Basic information about the Artemis program's Space Launch System and Orion capsule.

BUYING GUIDE The best astrophotography cameras require excellent low-light capabilities — check out our favorite models to watch for this Black Friday.

BUYING GUIDE The best star projectors bring the wonders of the cosmos into your home — find the best models here so you're ready for Amazon Prime Day.

Unlock the night sky with the best binoculars for stargazing designed to capture stars, planets, and distant galaxies — our top picks for Black Friday Week.

The best binoculars for kids should be lightweight, compact, and easy to handle — explore top picks before Amazon Prime Day arrives next week.

Find the best binoculars for wildlife, stargazing, tracking athletes, or plane spotting — check out top picks ahead of Amazon Prime Big Deals Day next week.

The best telescopes offer an unparalleled view of the cosmos, and we've gathered our favorites just in time for Amazon Prime Big Deals Day.

BUYING GUIDE These are the best air purifiers you can buy in every category, from Levoit Core 600S and BlueAir Blue Pure 411i Max to Dyson Purifier Cool.

BUYING GUIDE The best cameras for wildlife photography have impeccably accurate autofocus, a fast burst rate and sharp, detailed images — we've rounded up the best models.

An astronaut walks on the moon with a rover behind them

Think you know your constellations? See how many star groups you can name in 10 minutes and try to top the leaderboard.

There are 13 countries that sit on Earth's equator. Can you get them all in 5 minutes? If so, how fast can you do it?

These are the best walking treadmills you can buy in every category, from Mobvoi Home Treadmill to Bluefin Fitness Task 2.0 Treadmill.

Buying Guide These are the best exercise bikes you can buy in every category, from Peloton Bike and YOSUDA Bike to Schwinn IC4.

BUYING GUIDE These are the best dehumidifiers you can buy in every category, from Honeywell TP50WK to LG Puricare.

Buying Guide These are the best humidifiers you can buy in every category, from Dyson AM10 and Levoit LV600HH to HoMedics TotalComfort Deluxe.

Have a go at our killer whale quiz and find out if you'll make a big splash or a major fail.

BUYING GUIDE The best Fitbit wearables available to buy: Tried and tested to provide you with options from simple fitness trackers to feature-packed smartwatches.

Buying Guide These are the best fitness trackers you can buy in every category, from Apple Watch Series 8 and Garmin Fenix 7 to Amazfit Balance.