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The Earth-like planet is almost the same size as Earth, but it has a four-day year.

An international team of astronomers discovered a new planet that greatly resembles Earth in size.

The astronomers confirmed the existence of K2-415b, an exoplanet orbiting an M dwarf star some 72 light-years away from Earth, according to a press release.

## Discovering an alien world

The team behind the discovery set out to look for stars that could be suitable hosts for planets that may harbor life.

In a paper available in the preprint server arXiv, they explain how they used a method called radial velocity. Essentially, the gravity of orbiting exoplanets causes small wobbles in the light emitted by the planet’s host star. These wobbles change the color of the light, allowing astronomers to detect them from Earth.

Radial velocity is one of several methods astronomers use to detect exoplanets — any planet that is not part of our solar system. Other methods include direct imaging and the transit method, which measures the periodic drop in light of a distant star as an exoplanet passes between the star and an observatory’s field of view.

The human mind has long grappled with the elusive nature of time: what it is, how to record it, how it regulates life, and whether it exists as a fundamental building block of the universe. This timeline traces our evolving understanding of time through a history of observations in CULTURE, PHYSICS, TIMEKEEPING and BIOLOGY.

Australia’s first inhabitants, the ancestors of today’s aboriginal peoples, are believed to have embraced a timeless view of nature, in which the present and past are intimately connected. The spirits of long-dead ancestors, for example, were believed to inhabit the living. These spirits reflected a long-ago golden age sometimes known as the Dreamtime.

Brian Greene is a theoretical physicist. Please support this podcast by checking out our sponsors:
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OUTLINE:
0:00 — Introduction.
0:27 — Entropy.
8:35 — Consciousness.
24:54 — Quantum gravity.
28:14 — String theory.
41:41 — Time.
54:13 — Free will.
58:36 — Emergence and complexity.
1:05:48 — The Big Bang.
1:18:47 — Extraterrestrial life.
1:29:09 — Space exploration.
1:37:07 — Fear of death.

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Renowned physicist Neil Turok, Holder of the Higgs Chair of Theoretical Physics at the University of Edinburgh, joins me to discuss the state of science and the universe. is Physics in trouble? What hope is there to return to more productive and Simple theories? What is Peter Higgs up to?

Neil Turok has been director emeritus of the Perimeter Institute for Theoretical Physics since 2019. He specializes in mathematical physics and early-universe physics, including the cosmological constant and a cyclic model for the universe.

He has written several books including Endless Universe: Beyond the Big Bang and The Universe Within: From Quantum to Cosmos.

00:00:00 Intro.
00:03:28 What is the meaning of Neil’s book cover?
00:06:46 The Nature of the Endless Universe.
00:14:31 What would happen to James Clerk Maxwell and Michael Faraday on Twitter?
00:16:10 What’s wrong with physics today?
00:20:06 How did Neil’s life change after his theory was proven wrong?
00:23:28 Neil shows us fundamental laws of the Universe in equations.
00:33:59 How well do our modern equations satisfy the conditions of the observable Universe?
00:56:29 How is the Universe simple?
01:20:01 Can Neil’s model explain flatness without inflation?
01:54:54 Existential Questions on the meaning of life, advice to his former self, and things he’s changed his mind on.

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