Astronomers are offering the general public a once-in-a-lifetime opportunity: the chance to discover a new planet in our solar system.

Many astronomers now think there may be a massive, undiscovered planet lurking in the far reaches of our solar system. Right now, however, the existence of this planet is theoretical. So the hunt is on to actually capture an image of it.

Can you capture the energy of a city in just one image?

That's the idea behind Metropolis, a book of photos of the world's megacities by Dutch photographer Martin Roemers. The images illustrate the rapid rise of global urbanization. In 1994, there were 14 cities with a population over 10 million. In 2016, there were 29, according to the U.N.

In a surprising move, China's commerce ministry has announced that the country would be suspending its coal imports from North Korea. China released a statement Saturday saying that the freeze in imports will begin Sunday and will be in place through the end of the year.

Fresh Air Weekend highlights some of the best interviews and reviews from past weeks, and new program elements specially paced for weekends. Our weekend show emphasizes interviews with writers, filmmakers, actors and musicians, and often includes excerpts from live in-studio concerts. This week:

In 'Moonlight,' Actor Mahershala Ali Found Characters He Recognized: Ali has earned an Oscar nomination for his performance as Juan, a drug dealer who becomes an unlikely father figure to a boy who is being bullied at school and neglected at home.

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The generation that pioneered organic farming is beginning to retire. These farmers want what they've built to last. Some growers are passing on their farms to their kids. But not all of them have a second generation who wants to take over the family farm.

That's what longtime organic growers Tom and Denesse Willey discovered when they decided over the past few years that it was time to retire. When the Willeys asked their kids if they wanted to take over their 75-acre farm in California's Central Valley, they all said "no."

Updated at 10:25 a.m. ET

Poised on the brink of ushering in a new era, NASA's historic launch pad in Florida will need to wait another day for its milestone. At the last minute, the private space company SpaceX scrubbed its Saturday launch, which would have marked the first time the Kennedy Space Center's Launch Complex 39A was used in over half a decade.

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And now it's time for sports.

(SOUNDBITE OF MUSIC)

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Weekly Features

Events: February 17 - 23

There's plenty of events to keep you entertained this week, from the Deep in the Heart Film Festival to the Homespun Quilters Guild Show. But there's plenty more and you can hear all of it on this week's Act Locally Waco.

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Saturday at 11am with encores Sunday at 10am and 7pm