Key insights

• ⭕ The universe may be finite but have no borders, similar to a hypersphere
• 🌌 Gravity bends spacetime, creating a mild tension
• 🔭 Efforts to find a 'universe horizon' to determine the scale of the cosmic sphere
• 🍩 The universe may have a hyperdonut shape, affecting distance, time, and light perception
• 🤔 The concept of an infinite universe is difficult to comprehend
• ♾️ Infinity leads to the possibility of encountering exact repetitions of oneself
• 👥 In an infinite universe, there could be infinite copies of oneself
• 🌟 Brilliant.org offers interactive lessons to enhance scientific knowledge

Q&A

• What are the implications of an infinite universe?

  In an infinite universe, there could be infinite copies of oneself, each living in their own observable universe, but never able to interact with each other. Despite being infinite, the universe may have had a starting point with the big bang, leading to the possibility of encountering exact repetitions of oneself.

• Is the universe's infinity testable?

  The universe's infinity is untestable, but for us, it's finite with an observable edge in time. This concept is explored further in Brilliant.org's interactive lessons designed to enhance scientific knowledge and problem-solving skills.

• How is the universe's shape described?

  The universe could be shaped like a hypersphere or a hyperdonut, affecting how we perceive distance, time, and light. It may be at least 1,000 times bigger than our observable part and may exhibit a cosmic hall-of-mirrors effect. The concept of an infinite universe is also considered in cosmological models.

• What is the observable universe?

  The observable universe is a sphere with a radius of 45 billion light years. There is a possibility that the universe may be bigger than what we can see and could be either big but finite or truly infinite.

• 00:04 The observable universe is a sphere with a radius of 45 billion light years. The universe may be bigger than what we can see and could be either big but finite or truly infinite.
• 02:04 The universe could be finite but have no borders, similar to a hypersphere, with gravity bending spacetime and creating a mild tension that could bend the whole universe back on itself.
• 03:55 The universe could be shaped like a hypersphere or a hyperdonut, affecting how we perceive distance, time, and light. It could be at least 1,000 times bigger than our observable part and may exhibit a cosmic hall-of-mirrors effect. The concept of an infinite universe is also considered in cosmological models.
• 05:47 The concept of an infinite universe is difficult to comprehend and leads to paradoxes. Despite being infinite, the universe may have had a starting point with the big bang. Infinity leads to the possibility of encountering exact repetitions of oneself in an infinite universe.
• 07:42 In an infinite universe, there could be infinite copies of you, each living in their own observable universe, but never able to interact with each other.
• 09:35 The universe's infinity is untestable, but for us it's finite with an observable edge in time. Brilliant.org offers interactive lessons to enhance scientific knowledge and problem-solving skills.