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Would you believe there are 40 planets are in our Solar System? If you ask the IAU - the International Astronomical Union - there are only 8, but that might not be the best possible answer. If we take a more physics-based definition of what makes a planet a planet, we might have at least 40 planets in our Solar System, and maybe many more! Learn about these forgotten planetary bodies and what makes them so amazing - with some help from New Horizons principal investigator Alan Stern. Let's explore! Chapters: 0:00 Intro 0:20 What is a planet? 2:46 The planetary bodies 3:44 The big asteroids 4:42 The icy dwarfs 6:37 The 7 big moons 8:15 The other round moons 9:24 Conclusions Media Credits: Sagittarius A*: EHT Collaboration, CC BY 4.0 Kuiper Belt: by European Southern Observatory, CC BY 2.0 21 Lutetia: ESA / MPS / OSIRIS Team / Kevin Gill, CC BY 2.0 10 Hygiea: ESO/P. Vernazza et al./MISTRAL algorithm (ONERA/CNRS) Rhea Silvia Sclupture: Sailko, CC BY 3.0 Makemake: Hubble ESA, CC BY 2.0 Haumea Ring: Kevin Gill, CC BY 2.0 Planet Nine: Kevin Gill/Elizabeth Gill, CC BY 2.0 Jupiter and moons: Jan Sandberg End theme: "Jupiter" from Gustav Holst's "The Planets", performed by the United States Air Force Band (Public Domain)

Before modern telescopes, humans could only imagine what the surface of the sun and the planets looked like. Now advanced technology has made it possible to get in close, and take images of the Sun and the planets deep in our solar system. Now get ready to see the solar system as you’ve never seen it before, and see images that were so good they shocked astronomers.

Today, the job of naming things in space falls to the International Astronomical Union (IAU), the internationally recognized authority for naming celestial bodies and their surface features. NASA scientist Dr. Henry Throop explains more. Link to download this video: https://go.nasa.gov/3Qc2qMI

It's National Hispanic Heritage Month and we are sharing a powerful story about perseverance from NASA astronaut José Hernandez. Hernandez was a migrant worker as a child, and dreamed of one day going to space. His life story is portrayed in the movie, "A Million Miles Away," streaming on Prime Video. For our series "Note to Self," Hernandez shares a letter with his younger self about his journey to the stars and beyond.

Space shuttle Atlantis and its six-member crew began an 11-day delivery flight to the International Space Station on Monday with a 2:28 p.m. EST launch from NASA's Kennedy Space Center in Florida. The shuttle will transport spare hardware to the outpost and return a station crew member who spent more than two months in space. Atlantis is carrying about 30,000 pounds of replacement parts for systems that provide power to the station, keep it from overheating, and maintain a proper orientation in space. The large equipment can best be transported using the shuttle's unique capabilities.

Space shuttle Atlantis and its six-member crew began an 11-day delivery flight to the International Space Station on Monday with a 2:28 p.m. EST launch from NASA's Kennedy Space Center in Florida. The shuttle will transport spare hardware to the outpost and return a station crew member who spent more than two months in space. Atlantis is carrying about 30,000 pounds of replacement parts for systems that provide power to the station, keep it from overheating, and maintain a proper orientation in space. The large equipment can best be transported using the shuttle's unique capabilities.

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We are going to the Moon, to stay, by 2024. And this is how. Special thanks to William Shatner for lending his voice to this project. About NASA's Moon to Mars plans: https://www.nasa.gov/specials/moon2mars/

Space shuttle Atlantis and its six-member crew began an 11-day delivery flight to the International Space Station on Monday with a 2:28 p.m. EST launch from NASA's Kennedy Space Center in Florida. The shuttle will transport spare hardware to the outpost and return a station crew member who spent more than two months in space. Atlantis is carrying about 30,000 pounds of replacement parts for systems that provide power to the station, keep it from overheating, and maintain a proper orientation in space. The large equipment can best be transported using the shuttle's unique capabilities.

Black holes are the universe at its most extreme: matter and energy crunched so small they literally exit the known universe. Scientists are beginning to suspect that these monsters have a powerful impact on galaxies, solar systems and space-time itself. And now, researchers are finally getting a grip on these black holes with a new generation of high-tech laser systems and advanced telescopes in space. 'Black Hole' will trace the life cycle of a black hole - and the quest to understand it - from its violent birth in the early universe, to the final moments of Time itself.

How will a human Mars mission play out? Where exactly should it go? What unexpected challenges will we face? We're discussing all these aspects with Rick Davis. He is the Assistant Director for Science and Exploration, NASA’s Science Mission Directorate. 👉 NASA Blog Article on choosing the landing site on Mars: https://blogs.nasa.gov/redplanetdispa... 🦄 Support us on Patreon: / universetoday 00:00:00 Intro 00:01:29 Training for Mars on Earth 00:07:11 Choosing a landing site 00:20:37 Unexpected challenges of Mars 00:52:38 Planetary protection 00:56:51 Exploring lava tubes 00:59:49 What's next? 01:09:24 Outro

Leading aerospace engineer and Mars Society President Dr. Robert Zubrin has a dream. He wants to get humans to the planet Mars in the next ten years. Now, with the advent of a revolutionary plan, Mars Direct, Zubrin shows how we can use present day technology and natural resources on Mars to make human settlement possible. But can he win over the skeptics at NASA and the wider world? The Mars Underground is a landmark documentary that follows Zubrin and his team as they try to bring this incredible dream to life. Through spellbinding animation, the film takes us on a daring first journey to the Red Planet and envisions a future Mars teeming with life and terraformed into a blue world. A must-see experience for anyone concerned for our global future and the triumph of the human spirit. "This film captures the spirit of Mars pioneers who refuse to let their dreams be put on hold by a slumbering space program. Their passionate urge to walk the soil of an alien world is infectious and inspirational. This film is the manifesto of the new space revolution." James Cameron - Director of "Avatar" Please subscribe to Blue Mars Channel and new Mars Videos will be coming soon. SHOW YOUR SUPPORT! for our great content by clicking on the Fan Funding button on the BLUE MARS Channel page. We've got a special "Thank You" video.

What are the most violent and dangerous planets in our Solar System? One day the time may come when humans have developed technology advanced enough to send sections of Earth’s population to settle on other planets. What kinds of world can we expect to find, how do they compare with our own, and what measures would we need to take to adapt to their alien environments? Join us, as we take a journey through the Solar System and beyond, examining some of the most extreme characteristics of our planetary neighbours.

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