by Mary Hrovat
I think it was in the 1980s that I first saw t-shirts showing a drawing of a spiral galaxy with an arrow indicating “You are here.” They were amusing, and the image provides a bit of cosmic context. You may be here, looking at this screen, with your to-do list and personal problems and worries about the world, but you’re also here in the Orion arm of the Milky Way, about 25,000 light years from the center, in this solar system, on this planet.
One way to capture the most local part of your cosmic context is the 3D solar simulator at The Sky Live, which shows a simulated snapshot of the locations of all the planets relative to the sun at this moment. You can zoom in and out and add asteroids, near-Earth objects, and comets. You can also animate the simulation. At one week per second, you get a pretty good view of the tight circling of the inner planets, but the outer planets move at a very sedate pace. At one year per second, the inner planets move too quickly to follow easily, but the outer planets sweep along briskly.
Of course, you can also observe the solar system from the inside. One great way to broaden your horizons is to go out in the evening to see what other planets in the solar system are visible and to watch them moving along in their orbits over the weeks and months. There are a number of guides to what you can see on a clear night. Sky & Telescope provides a weekly update that tells you which planets will be visible, what phase the moon is in, and whether there will be any events such as eclipses or meteor showers. Space.com offers a monthly summary that covers a somewhat broader range of things to look for in the night sky, and EarthSky describes what you can see in the sky tonight.
In addition, space is not an unchanging backdrop but a place with its own weather (sort of) and events. Spaceweather.com posts news stories about solar activity, aurorae, meteor showers, fireball observations, and more. The sidebar on the left shows current data and images. Read more »