Discovery Science TV Guide — Tuesday, 21 July 2026

Browse the full Discovery Science TV guide for Tuesday, 21 July 2026. 29 programmes listed , including 9 tonight. UK listings updated daily — scroll down to tonight's highlights or use the day tabs above to browse the weekly schedule.

Early Morning

00:00 1h

Nasa's Unexplained Files

The Black Hole Next Door

Astronomers discover a rogue black hole speeding through the Milky Way

When astronomers discover a rogue black hole speeding through the Milky Way, they investigate how much danger it poses to Earth

01:00 1h

How the Universe Works

S5 · E6 · Secret History of Pluto

Scientists investigate whether there might be warm liquid water on Pluto

Despite Pluto's appearance as a dark and frozen world, scientists investigate whether there might be warm liquid water beneath the surface

02:00 1h

How the Universe Works

S5 · E7 · The Dark Matter Enigma

The science of dark matter

The documentary series investigates dark matter, a mystery that continues to elude scientists today, and one that could be behind the formation of supermassive black holes

03:00 1h

How the Universe Works

S5 · E8 · Strangest Alien Worlds

Exploring whether a planet similar to our own will ever be found

Astronomers have discovered bizarre planets very different to Earth out in the galaxy, but will a planet similar to our own will ever be found

04:00 1h

Truth Behind the Moon Landing

S1 · E3 · CIA's Secret Space War

Experts investigate American espionage during the Apollo programme.

Confidential CIA files reveal a secret war for space between America and the Soviets. And, experts investigate American espionage during the Apollo programme.

05:00 1h

Truth Behind the Moon Landing

S1 · E4 · Killing Armstrong

A crash that nearly killed astronaut Neil Armstrong

Experts investigate the Lunar Landing Research Vehicle crash that nearly killed astronaut Neil Armstrong during his training

Morning

06:00 30m

Teleshopping

Home shopping

Buying goods from the comfort of home

06:30 30m

Teleshopping

Home shopping

Buying goods from the comfort of home

07:00 30m

Teleshopping

Home shopping

Buying goods from the comfort of home

07:30 30m

Teleshopping

Home shopping

Buying goods from the comfort of home

08:00 1h

Nasa's Unexplained Files

S5 · E3 · The Sun's Evil Twin

The mysteries surrounding the sun's supposed 'dark twin'

Experts shed light on the mystery of why two suns seemed to appear in the skies over Indonesia, prompting rumours of the existence of a 'dark twin' of Earth's life-bringing star

09:00 1h

Nasa's Unexplained Files

S3 · E20 · Earth's Secret Aliens

The truth about strange 'alien' deposits found on Earth's surface

Geologists begin to ask questions about 'alien' deposits found on the Earth's surface - and the answer could shed light on the cause of history's greatest extinction event

10:00 1h

Nasa's Unexplained Files

S5 · E5 · Stonehenge on Mars

A familiar structure on the surface of Mars

A NASA probe captures an image of a familiar structure on the surface of Mars. What made 'Mars Henge'? Plus, how did an Apollo astronaut get sick on the moon?

11:00 1h

Savage Builds

S1 · E3 · MMMelee

Adam Savage builds three motorised vehicles inspired by post-apocalyptic worlds

Using material salvaged from scrap yards, Adam Savage and two colleagues design and build three motorised vehicles inspired by post-apocalyptic worlds

Daytime

12:00 1h

Savage Builds

S1 · E4 · Meteorite Sword

Adam attempts to build a version of King Arthur's legendary sword, Excalibur

Adam wants to build his own version of King Arthur's legendary sword, Excalibur. Using the iron found in a meteorite, he attempts to make an indestructible weapon

13:00 1h

The Dino Hunters

S1 · E1 · Dinosaur Cowboys

In Wyoming, Mike and his son uncover a triceratops horn

Montana rancher Clayton finds what might be a rare and valuable fossil on his family's property. In Wyoming, Mike and his son uncover a triceratops horn

14:00 1h

The Dino Hunters

S1 · E2 · Million-Dollar Dino

Clayton continues his excavation of a rare, carnivorous dinosaur on his ranch.

Clayton continues his excavation of a rare, carnivorous dinosaur on his Montana ranch. In Wyoming, Mike and Jake prepare to sell their prized T-Rex fossil.

15:00 1h

Killers of the Cosmos

S1 · E3 · Cosmic Scrap

Pieces of small space debris that are floating around the Earth

More than 100 million pieces of small space debris are floating around the Earth. A big collision between two of these objects in low Earth orbit could be catastrophic

16:00 1h

Killers of the Cosmos

S1 · E4 · Little Green Men

Experts investigate extra-terrestrial beings and their threat to human life

Aliens could be lethal killers who want to invade and plunder our world. A team of experts investigate extra-terrestrial beings and their threat to human life.

17:00 1h

Killers of the Cosmos

S1 · E5 · Dark Star

Exploring the secrets of black holes

Exploring the secrets of black holes, and the potential some of them have to be lethal to life on planet Earth

Tonight's Highlights

18:00 30m

How It's Made: Dream Cars

S2 · E20 · Lotus Evora

The Lotus Evora

The crew visits the birthplace of the Lotus Evora, revealing its inner workings and admiring its attractive design

18:30 30m

How It's Made

S25 · E2 · Nuno Felt/Drum Crushers

Kimchi and traditional parquet floors

More everyday items go under the microscope as the production methods behind objects including kimchi and traditional parquet floors are revealed

19:00 30m

How It's Made

S25 · E3 · Wood Watches/Steel Bicycles

Raw pet food and replica police lanterns

More everyday items go under the microscope. How are objects including raw pet food and replica police lanterns made?

19:30 30m

How It's Made

S25 · E6 · Fireplace Bellows/Calissons

The development of calissons and diving watercrafts

More everyday items go under the microscope, with this edition explaining how objects including calissons and diving watercrafts are made

20:00 30m

How It's Made

S25 · E7 · Artist Brushes/DEF Tank Heaters

The development of game tables and art glass wall sconces

More everyday items go under the microscope as the programme reveals how objects including game tables and art glass wall sconces are made

20:30 30m

How It's Made

S25 · E8 · Foosball Tables/Marseille Soap

The development of Marseille soap and Laguiole pocket knives

A look at how everyday objects such as Marseille soap and Laguiole pocket knives, are made and how techniques have been refined over time

21:00 1h

Savage Builds

S1 · E2 · Wheel of Death

Adam Savage joins forces with a NASA engineer to rebuild a rocket-propelled super weapon

Adam Savage joins forces with a NASA engineer to rebuild a rocket-propelled super weapon, originally built to breach barbed wire in the Second World War

22:00 1h

Extreme Engineering

S8 · E10 · Port of Rotterdam

Expanding the Port of Rotterdam

Danny Forster visits Rotterdam to examine plans to expand the city's port - the largest earth-moving project in history

23:00 1h

You Have Been Warned

S6 · E5 · Owned It

From lighting matches with bullets to kayaking in the snow

A countdown of the top 20 internet legends. From lighting matches with bullets to kayaking in the snow, this features only the smartest and bravest human-kind has to offer!

Early Morning

Morning

Daytime

Tonight's Highlights

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