A drama based on David Nicholls' novel Us starts on BBC One, Maia Dunphy presents What Planet Are You On?, The Movies hits the 1970s, and Professor Brian Cox hosts The Planets, . . .

Pick of the Day

Us, 9.00pm, BBC One

Three weeks, six countries - one divorce? Sometime you need to spend time together to see why you're falling apart . . .

Tom Hollander and Saskia Reeves star in a drama based on the hit novel by David Nicholls.

Douglas Petersen (Hollander) is looking forward to a grand tour of Europe with his wife Connie  (Reeves) and their only son Albie.

It’s supposed to be the trip of a lifetime - a last chance for the three of them to spend quality time together before Albie leaves home for university. But things don’t go as Douglas has meticulously planned.

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Don't Miss

The Movies, 9.00pm, Sky Documentaries & NOW TV

As the series reaches the 1970s, directors become masters of the medium as Spielberg (below), Coppola, Scorsese, Lucas and other filmmakers create a New Hollywood that pushes the medium of moviemaking to its apex.

It’s also a time when a new generation of movie stars such as Robert DeNiro, Jack Nicholson, and Pam Grier light up the screen. Heady times.

The South Westerlies, 9.30pm, RTÉ One

As the drama starring Orla Brady (below) continues, the surprise arrival of NorskVentus boss Sigrid puts further pressure on her character Kate, while a surfing accident forces her to reveal her big lie to Baz.

New or Returning Shows

The Planets, 8.00pm, RTÉ2

Professor Brian Cox tells the life story of the solar system, beginning with the development of Mercury, Venus, Earth and Mars.

Examining the rocky planets at the centre of the Solar System, Professor Cox examines new evidence about the violent creation of Mercury and the hostile atmosphere of Venus, contrasting them with the life-giving planet Earth and the barren Mars.

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What Planet Are You On?, 6.30pm, RTÉ One

Maia Dunphy presents this environmental challenge in which four families try to reduce their carbon footprint, with the winners after four weeks awarded a handy €5,000.

Scotland’s Scenic Railways, 8.00pm, Channel 4

Beneath vast mountains and across open moorlands, Scotland's railways connect coastal towns and rural villages through a breathtaking Highland landscape, with what has been voted the world's most beautiful railway.

This programme looks back at the people who work on the railway and the steam enthusiasts who safeguard these iconic routes, providing an extraordinary glimpse into a diverse community united by a passion for Scotland's railways.

Viewers can see what it’s like aboard the Flying Scotsman along the Fife coast and over the Forth Bridge and follow the engineers responding to a landslide that threatens the world-famous West Highland Line.

The Forgotten West Memphis Three - A Notorious Crime, 9.00pm, Sky Crime & NOW TV

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Based on the podcast Truth & Justice, this series follows host Bob Ruff as he re-examines the 1993 murders of 8-year-old Stevie Branch, Michael Moore and Christopher Byers in the hope of uncovering new information.

In the opening episode, Bob Ruff explores the original case’s flaws to lay the groundwork for his evidence-driven investigation.

After determining the boys’ final movements, Bob meets with a DNA expert to discuss new technology that might break the case wide open.

Equator, 7.00pm, Sky Nature & NOW TV

For much of the year the African Savannah bakes under the oppressive Equatorial sun.

The dryness is unusual for the Equator, whose regions are often covered with dense rainforests and associated with a seasonless annual cycle.

9/11: The Pentagon Special, 9.00pm, Sky History & NOW TV

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On September 11, 1941, the US War Department broke ground on a massive new five-sided headquarters that would rise to become the ultimate symbol of the American military.

60 years to the day after construction began, a hijacked airliner crashed into the building as part of the largest coordinated terror attack ever on American soil.

Told by the men and women who lived it, this is the dramatic story, a raw eyewitness account of tragedy, heroism and survival on a day that shocked a nation.

Ending Tonight

Fleadh Cheoil 2000, 9.30pm, TG4

The final programme in the series looks back at the music, fun and excitement as Fleadh Cheoil na hÉireann returned to Enniscorthy, County Wexford in 2000

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