How far is the mesosphere from Earth? What is the perihelion distance of Halley's Comet? In the solar system, what is the farthest planet from Earth? What is the distance around the Earth? How was Eris discovered? How far is 100 astronomical units?
The sun is just one of about 200 billion stars in the Milky Way, our home galaxy, which is just one galaxy in the universe. So, how many galaxies are in the universe? In this article, we'll find out how galaxies were discovered and what types exist, what they're made of,...
Focuses on several astronomy-related issues. Question on the distance to Andromeda Galaxy; Comments on a profile of astronomer Gerard Kuiper; Response of the Apache people to an article about their resistance to the development...
Copernicus, of Poland, felt the Ptolemaic view of the planets traveling in circular orbits around the Earth was over-complicated with many smaller circles, epicycles, needed to explain the intermittent retrograde motion of the planets (in which they appear to move in the opposite direction of the...
Vera Rubin: The astronomer who brought dark matter to light Clyde Tombaugh: Astronomer who discovered Pluto Maria Mitchell: Astronomer & Feminist The astronomer (also mathematician, physicist and philosopher) turned the new observational tool toward the heavens, where he discovered the four primarymoons...
How heavy was the Hubble Space Telescope? How many stars are in the Andromeda Galaxy? What is the magnification of the Hubble Telescope? What has the Hubble Telescope discovered about the universe? How many miles of wire are in the Hubble Telescope?
Basically, in 2.5 million years, it hasn't moved at all. If we scaled M31 down, so it was roughly the size of a human, it would have moved around 1/2" in 2.5 million years. Clear skies! Thomas, Denmark Apologies for my rubbish math skills, but if the Andromeda Galaxy was scaled ...
Because the universe was much smaller, galaxies were huddled closer together, and, shooting out from the origin of the Big Bang, were likely to collide into others during their journey throughout space. Even our own galaxy, the Milky Way, carries with it debris from early collisions with ...
The Andromeda Galaxy. Credit: Adam Evans We see examples of these fossil galaxies when we look out into the universe. Here's M49, a supermassiveelliptical galaxy. Who knows how many grand spiral galaxies stoked the fires of that gigantic cosmic engine?
Recently, Jorge Pearrubia, a senior academic at Edinburgh University, UK, and his team discovered something interesting: The mass of the Milky Way is only half as much as the mass of another nearby galaxy, Andromeda. This seems strange, and dark matter may explain why. ...