7:12 Astronomy - Alan Gilmour

This image released Wednesday, April 10, 2019, by Event Horizon Telescope shows a black hole. Scientists revealed the first image ever made of a black hole after assembling data gathered by a network of radio telescopes around the world.

Photo: AP/ Event Horizon Telescope Collaboration / Maunakea Observatories

Former University of Canterbury Mt John Observatory superintendent Alan Gilmore join us once again.  In his gaze tonight he has the moon and asteriods, the black hole image and SpaceX's controversial satellites.

A screenshot from a video of SpaceX Starlink satellites passing over Leiden, Netherlands on 24 May, 2019.

A screenshot from a video of SpaceX Starlink satellites passing over Leiden, Netherlands on 24 May, 2019. Photo: AFP / HO/ Marco Langbroek, Leiden, the Netherlands

7:30 Song Crush

The Song Crush team this week has new music ranging from scandipop to jazz. Host Kirsten Johnstone is joined by RNZ Afternoons producer Emile Donovan, Inside Out host Nick Tipping, and RNZ Music's Tony Stamp.

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Photo: RNZ / Pinky Fang

8:05 Matariki Stories

Rangi Matamua, Maori Astronomer and Professor at the University of Waikato.

Rangi Matamua, Maori Astronomer and Professor at the University of Waikato. Photo: Supplied Spark NZ

Over the next couple of weeks we're featuring a series of Matariki Stories - which will introduce us to a different star every night just after 8.

The stories have been developed by Maori Astronomer, Rangi Matamua, Professor at the University of Waikato and Spark and are narrated by Radio presenter, Stacey Morrison, Te Karere host, Scotty Morrison and tikanga expert, Rhonda Tibble.

Tonight we have the story of Tupu-ā-rangi.

8:10 Seed Pods

The Beautiful Brain logo (Supplied by Audible)

The Beautiful Brain logo (Supplied by Audible) Photo: Supplied

Richard Scott of The Podcast Hour introduces us to The Beautiful Brain which mixes personal stories and journalism to uncover what we know about contact sports and our brain health.

Brain model

Brain model Photo: Photo by Robina Weermeijer on Unsplash

8:15 Dateline Pacific

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Photo: RNZ

RNZ Pacific's daily current affairs programme covering the major Pacific stories of the week, with background and reaction from the people making the news.

8:30 Window on the World

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Photo: Evka W [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)]

Despite the political uncertainty in the UK at the moment, the country's reputation for top-class education (if you can afford it) is still on the rise.

Chinese students are worth around five billion pounds a year to the British economy, and brands like Eton, Harrow, Cambridge and Oxford attract pupils from across China with their promise of a traditional, privileged education.

Liyang Liu with this report for the BBC World Service.

9:07 Tuesday Feature

Multiculturalism was once the dream of many countries around the world, encouraging ethnically diverse cultures to live side by side in harmony. But critics say that dream has failed: that too many communities live separately - pursuing segregation rather than integration, fueling dangerous resentment. Can you have a multi-racial, multi-faith society, without forcing people of different cultures to assimilate? Our Tuesday Feature tonight is a BBC Global Questions discussion on the Question - 'Is Multi-culturalism failing?

10:17 Lately

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Photo: RNZ

Lately with Karyn Hay is a late night radio show on RNZ National, with an eye on live events, an ear for music, a great sense of humour and a genuine interest in people and their stories.

11:07 Worlds of Music

Blue Smoke recorded by Pixie Williams 1949

Blue Smoke recorded by Pixie Williams 1949 Photo: Supplied

Trevor Reekie hosts a weekly music programme celebrating an eclectic mix of 'world' music, fusion and folk roots. Tonight features an interview about a record that laid the foundation for our local recording industry when it was first released in 1949. The song Blue Smoke is the first record wholly produced in New Zealand - from composition to pressing.

Written by Ruru Karaitiana and sung by Pixie Williams, the 78 rpm disc of Blue Smoke went on to sell over 50,000 copies for the New Zealand-owned TANZA record label.
The interview was recorded in 2011 with Pixie Williams' daughter, Amelia Costello, plus Chris Bourke, the author of the defining book 'Blue Smoke - The Lost Dawn of New Zealand Popular Music 1918-1964' and Tim Fraser who supervised sound restoration of a record that launched the NZ Recording Industry 70 years ago.