Biggest things in space

Category: Astronomy

On Earth and in the Universe, size matters, but it matters in different ways. In Space, bigger is not necessarily better.

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Harmony of the Worlds

Beginning with the separation of the fuzzy thinking and pious fraud of astrology from the careful observations of astronomy, Sagan follows the development of astronomical observation. Beginning with constellations and ceremonial calendars (such as those of the Anasazi), the story moves to the debate between Earth and Sun-centered models: Ptolemy and the geocentric worldview, Copernicus' theory, the data-gathering of Tycho Brahe, and the achievements of Johannes Kepler (Kepler's laws of planetary motion and the first science-fiction novel).

3/13Cosmos: A Personal Voyage • 1980 • Astronomy

The Milky Way

Today we’re talking about our galactic neighborhood: The Milky Way. It’s a disk galaxy, a collection of dust, gas, and hundreds of billions of stars, with the Sun located about halfway out from the center. The disk has grand spiral patterns in it, formed by the traffic jams of stars and nebulae, where stars are born. The central region is shaped like a bar, and is mostly old, red stars. There’s also a halo surrounding us of old stars.

37Crash Course Astronomy • 2015 • Astronomy


Explores science at the very limits of human perception, where we now understand the deepest mysteries of the universe lie. Jim Al-Khalili sets out to answer one very simple question - what is nothing? His journey ends with perhaps the most profound insight about reality that humanity has ever made. Everything came from nothing. The quantum world of the super-small shaped the vast universe we inhabit today, and Jim Al-Khalili can prove it.

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The Long Astronomical Perspective

Carl Sagan talks about our future and the exploration of space

7/10The Sagan Series • 1989 • Astronomy

Space Elevator

It's hard to get to space.But there is a concept that might make it possible: the space elevator. How exactly does it work.

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Man on Mars: Mission to the Red Planet

Horizon goes behind the scenes at Nasa to discover how it is preparing for its most ambitious and daring mission: to land men - and possibly women - on the surface of Mars.

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