10 Best Episodes of Cosmos

Famed astrophysicist Neil deGrasse Tyson provides clarity for the vision of the cosmos as he voyages across the universe with never-before-told stories that delve into the scientific concepts of the laws of gravity and the origins of space and time.

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Cosmos - S1E13

#1 - Unafraid of the Dark (Season 1 - Episode 13)

The Ship of the Imagination makes a final journey to explore one of the biggest mysteries of the universe: dark energy. Meet one of science's greatest unsung heroes, Fritz Zwicky, whose prediction of supernovas paved the way for our larger understanding of dark energy, the unknown force in the universe that overwhelms gravity on the grandest scale. On our final voyage, discover the romantic message embedded in Voyager's Interstellar Golden Record and contemplate the spiritual experience of life on Earth as our cosmic journey concludes with Carl Sagan's unforgettable meditation, The Pale Blue Dot.

The episode was rated 8.80 from 1019 votes.

Cosmos - S1E10

#2 - The Electric Boy (Season 1 - Episode 10)


Travel to 19th century England and meet Michael Faraday, a child of poverty who grew up to invent the motor and the generator. His ideas about electricity and discovery of magnetic fields changed the world and paved the way for future scientists to make giant strides in the world of high technology and instantaneous communication

The episode was rated 8.60 from 1071 votes.

Cosmos - S1E1

#3 - Standing Up in the Milky Way (Season 1 - Episode 1)

The Ship of the Imagination, unfettered by ordinary limits on speed and size, drawn by the music of cosmic harmonies, can take us anywhere in space and time. It has been idling for more than three decades, and yet it has never been overtaken. Its global legacy remains vibrant. Now, it's time once again to set sail for the stars.

The episode was rated 8.57 from 2723 votes.

Cosmos - S1E5

#4 - Hiding in the Light (Season 1 - Episode 5)


The Ship of the Imagination travels back in time to reveal 11th century Europe and North Africa during the golden age of Islam, when brilliant physicist Ibn al-Haytham discovered the scientific method and first understood how we see, and how light travels. Later, William Herschel discovers the infrared and the signature hidden in the light of every star, eventually unlocking one of the keys to the cosmos.

The episode was rated 8.52 from 1433 votes.

Cosmos - S1E4

#5 - A Sky Full of Ghosts (Season 1 - Episode 4)

An exploration of how light, time and gravity combine to distort our perceptions of the universe. We eavesdrop on a series of walks along a beach on summer nights in the year 1809. William Herschel, whose many discoveries include the insight that telescopes are time machines, tells bedtime stories to his young son, John, who will grow up to make some rather profound discoveries of his own.

The episode was rated 8.52 from 1536 votes.

Cosmos - S1E3

#6 - When Knowledge Conquered Fear (Season 1 - Episode 3)


There was a time, not so long ago, when natural events could only be understood as gestures of divine displeasure. We will witness the moment that all changed, but first--The Ship of the Imagination is in the brooding, frigid realm of the Oort Cloud, where a trillion comets wait. Our Ship takes us on a hair-raising ride, chasing a single comet through its million-year plunge towards the Sun.

The episode was rated 8.50 from 1651 votes.

Cosmos - S1E8

#7 - Sisters of the Sun (Season 1 - Episode 8)

Discover the remarkable story of Annie Jump Cannon and Cecilia Payne, two incredible women who challenged conventional wisdom and uncovered the real-life story of the stars. Cannon led a group of astronomers in the early 20th century to catalogue the spectral characters of stars, and two decades later Payne joined forces with Cannon to analyze the data and uncover the chemical compositions of the stars. Later, travel on the Ship of the Imagination to explore the lives and deaths of stars and visit the planet of a star orbiting a globular cluster.

The episode was rated 8.49 from 1130 votes.

Cosmos - S1E12

#8 - The World Set Free (Season 1 - Episode 12)


The Ship of the Imagination travels to our near neighbor Venus, where we begin our journey to discover the long history of global warming and the greenhouse effect. Later, explore the detrimental effects of climate change and trace the magnitude of our impact on the Earth’s atmosphere. However, with knowledge, technology and science within our grasp, imagine a hopeful future where we dedicate our efforts to taking care of our home, Planet Earth.

The episode was rated 8.49 from 958 votes.

Cosmos - S1E11

#9 - The Immortals (Season 1 - Episode 11)

The Ship of the Imagination travels across the cosmos to discover the possibility of beings that live forever and explain why other civilizations perish. Then, visit the Cosmic Calendar of the Future and contemplate what lies ahead with a hopeful vision.

The episode was rated 8.48 from 1024 votes.

Cosmos - S1E2

#10 - Some of the Things that Molecules Do (Season 1 - Episode 2)


Host Neil deGrasse Tyson is on a voyage to explore the relatedness of all livings things and the possible evolution of life in the cosmos. Go on a journey to discover how artificial selection turned the wolf into canine breeds and how natural selection sculpted the complex human eye. Later, Tyson visits the grand Hall of Extinction, a monument to all the broken branches on the tree of life. Retrace the story of life on Earth and the unbroken thread that stretches from the first one-celled organisms to human life.

The episode was rated 8.46 from 2002 votes.

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    Cosmos - S1E9

    #11 - The Lost Worlds of Planet Earth (Season 1 - Episode 9)

    The Ship of the Imagination embarks on a journey through space and time to grasp how the autobiography of the Earth is written in its atoms, its oceans, its continents and all living things. Later, American geologist Marie Tharp creates the first true map of Earth’s ocean floor, and discovers microscopic life that exists deep beneath the ocean

    The episode was rated 8.40 from 1113 votes.

    Cosmos - S1E7

    #12 - The Clean Room (Season 1 - Episode 7)


    To determine the true age of the Earth, geochemist Clair Patterson developed the uranium-lead dating method to make an unprecedented discovery—calculating Earth's age of 4.5 billion years. But Patterson's groundbreaking discoveries were just beginning. Patterson made it his mission to draw public attention to the detrimental effects of lead in the environment and dedicated his career to fighting against the petroleum and chemical industry, eventually achieving public health's biggest victory of the 20th century.

    The episode was rated 8.39 from 1220 votes.

    Cosmos - S1E6

    #13 - Deeper, Deeper, Deeper Still (Season 1 - Episode 6)

    The Ship of the Imagination ventures on an epic voyage to the bottom of a dewdrop to explore the universe on the smallest scale and observe exotic life forms invisible to the naked eye. Then, host Neil deGrasse Tyson explains the neural network in our brains which determine our sense of smell and memory, and later, he travels deep beneath the surface of the Earth to discover the most mysterious particle we know.

    The episode was rated 8.36 from 1278 votes.

    Cosmos - S2E9

    #14 - Magic Without Lies (Season 2 - Episode 9)


    Meet the man who stumbled on a hole in the reality of quantum mechanics and the still-unfolding technology that made it possible.

    The episode was rated 8.30 from 111 votes.

    Cosmos - S2E2

    #15 - The Fleeting Grace of the Habitable Zone (Season 2 - Episode 2)

    There is no refuge from change in the cosmos. There will come a time in the life of the Sun when Earth will no longer be a home for us. The story of our ancestors who rose to a comparable challenge and a long-term vision of our future on other worlds.

    The episode was rated 8.15 from 145 votes.

    Cosmos - S2E8

    #16 - The Sacrifice of Cassini (Season 2 - Episode 8)


    The mysterious untold story of the scientist who figured out how to go the Moon while fighting for his life in a WWI trench. He wrote a letter to fifty years in the future. It made the Apollo Mission possible. And the saga of the twenty-year long odyssey of a robotic explorer ordered to commit suicide on another world.

    The episode was rated 8.06 from 110 votes.

    Cosmos - S2E4

    #17 - Vavilov (Season 2 - Episode 4)

    In the first half of the 20th century pioneering geneticist Nikolai Vavilov traveled 5 continents assembling a treasury of the worlds seeds. He dreamed that science could be the means to end hunger. His refusal to tell a scientific lie cost him his life. The heroism of his colleagues and its direct impact on your life is one of the most stirring stories in the history of science.

    The episode was rated 8.06 from 129 votes.

    Cosmos - S2E1

    #18 - Ladder to the Stars (Season 2 - Episode 1)


    An adventure spanning billions of years into the evolution of life and consciousness. A visit to a 100,000-year-old laboratory. The story of the change in life-style that radically altered human existence and the life of the heretic who found god in the book of nature, opening our way to the stars.

    The episode was rated 8.06 from 194 votes.

    Cosmos - S2E3

    #19 - Lost City of Life (Season 2 - Episode 3)

    A new vision of genesis at the bottom of the blood red sea of the infant Earth. And the story of the man who found the first clues to life's beginning in a green jewel. As he searched for life's origin, he risked his own, daring to toy with his Nazi tormentors.

    The episode was rated 8.02 from 133 votes.

    Cosmos - S2E10

    #20 - A Tale of Two Atoms (Season 2 - Episode 10)


    How a deadly embrace between science and state altered the fate of the world, and a gripping cautionary tale of mass casualty and unlikely survival.

    The episode was rated 7.84 from 102 votes.


    Last updated: feb 02, 2023

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