About this episode

This episode explores the impact of ancient asteroid collisions on Earth's continents and discusses new findings about Uranus and Neptune.

SpaceTime Series 29 Episode 80 Did ancient asteroid impacts prevent Earth’s continents from forming A new study suggests the barrage of asteroid impacts that slammed into the ancient Earth during the Hadean Eon between 4.6 and four billion years ago may have prevented the formation of the planet’s first continents. Could the ice giants Uranus and Neptune really be magma worlds A new study suggests that the solar systems two ice giants Uranus and Neptune might actually be magma worlds. World’s biggest atom smasher powers down The world’s most powerful atom smasher has been shut down for a four year major refit. The Science Report Sedentary behaviour linked to a 9% higher risk of death by cancer. Confirmation that mRNA vaccines are safe and highly effective. Artificial night time lighting has made planet Earth 16 percent brighter between 2014 and 2022. Study shows sending an electric current through black coffee can measure its strength and roast. Skeptics guide to AI and misinformation . Our Guests This Week: Professor Tim Johnson from Curtin University And our regular guests: Alex Zaharov-Reutt from techadvice.life Tim Mendham from Australian Skeptics 🌏 Get Our Exclusive NordVPN…

People in this episode

Host: Stuart Gary

Guest: Professor Tim Johnson

Topics covered

• asteroid impacts
• Uranus
• Neptune
• magma worlds
• sedentary behavior
• mRNA vaccines
• artificial lighting

Keywords

• asteroid impacts
• Earth
• Uranus
• Neptune
• magma worlds
• cancer risk
• mRNA vaccines
• nighttime lighting
• black coffee
• AI misinformation

Sponsors

NordVPN

Mentioned in this episode

Organizations: Curtin University, Australian Skeptics

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• Cosmic Discoveries: Japan's Asteroid Encounter and the Life Potential of Europa · July 15, 2026 · 28 min
• Earth's Ancient Impact Revealed: Dating the Oldest Crater and China's Cosmic Quest · July 13, 2026 · 31 min
• Mars to Earth: China's Ambitious Sample Return Mission and Cosmic Anomalies · July 9, 2026 · 19 min
• How a Passing Star Redirected Comets and Redefined Our Milky Way Map · July 8, 2026 · 24 min

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