Galaxies are astronomical objects composed of billions or even trillions of stars. Our Earth and solar system are just a tiny ...

Need a new idea to keep kids entertained? Try stargazing. Free learning activities and videos about the solar system Free learning activities and videos about the solar system Free learning ...

Helium can help scientists detect the speed and direction at which we’re moving through space. Deuterium, which is left over ...

Just as we have found that Earth is not the center of the solar system, and the Sun ... so too have we found that our galaxy holds no special place in the universe. Galaxies observed in the ...

And we've even observed fluctuations of starlight in our own galaxy ... of solar system physics, but it also gives us a new window into astrophysics, into early-universe cosmology, and into ...

And the Milk Way is just one galaxy in the Universe. Solar System – A group of objects orbiting around a star. Planet – A large, spherical object orbiting a star. Moon – A large object ...

However, it is now considered a dwarf planet instead. The universe has billions of galaxies, and our solar system is in the Milky Way Galaxy. The Milky Way contains at least 100 billion other ...

The Milky Way is just a speck in a universe ... mass for a galaxy to make estimates possible. "If we set a mass cutoff and try to make this conservative, like a million solar masses, we end ...

What If is a Webby Award-winning science web series that takes you on a journey through hypothetical worlds and possibilities, some in distant corners of the universe, others right here on Earth.