Make sure you familiarize yourself with the data before downloading a lot of it!įor high-resolution aerial imagery, your options are much more limited. A warning: these are very large files and the imagery itself is lower resolution than what you might expect to see on a typical web map.
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MODIS (NASA’s satellite constellation which images the earth every 1-2 days)ĭata from all three of these satellite constellations can be downloaded for free from either Earth on AWS or Google’s Earth Engine Catalog.Landsat 8 (the USGS’s satellite which images the earth once every 16 days).Sentinel-2 (the European Space Agency’s constellation of satellites imaging the entire landmass of the earth once every five days).Here’s where things get interesting-we’ve written previously about the explosion of freely available, openly licensed, and constantly updating satellite imagery in our blog post, An Introduction to Satellite Imagery and Machine Learning. For larger-area basemaps, satellite imagery providers make more sense: and Australia and has a very simple user interface available through any web browser.
For high-resolution aerial imagery, NearMap orthographics provide great coverage in the U.S.
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Rather than license imagery from Google that they’re, in turn, licensing from imagery providers, it usually makes more sense to go directly to the source. Google’s Maps API is notoriously stingy in this regard, with its terms of service even limiting your right to display content derived from Google imagery on a map that isn’t also provided by Google. tracing building footprints or other cartographic features), you should consider a paid option that allows for derivative works to be produced. If you’re considering deriving a commercial product from the imagery you’re browsing (e.g. This article has been updated to correct the distances to the nearest star and galaxy.Some other great sources of non-commercial, non-downloadable imagery are: We won’t be able to answer every question, but we will do our best. Hello, curious kids! Do you have a question you’d like an expert to answer? Ask an adult to send your question to Please tell us your name, age and the city where you live.Īnd since curiosity has no age limit – adults, let us know what you’re wondering, too.
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How to answer this question will need to be figured out by a future scientist. Scientists now consider it unlikely the universe has an end – a region where the galaxies stop or where there would be a barrier of some kind marking the end of space.īut nobody knows for sure. In either case, you could never get to the end of the universe or space. If this were the case for the universe, it would mean it is not infinitely big – although it would still be bigger than you can imagine. If you start walking any direction, east for example, and just keep going, eventually you would come back to where you began. One way to think about this is to picture a globe, and imagine that you are a creature that can move only on the surface. Some scientists think it’s possible the universe might eventually wrap back around on itself – so if you could just keep going out, you would someday come back around to where you started, from the other direction. In that case, the universe would be infinite, with no end. Many think it’s likely you would just keep passing galaxies in every direction, forever. These are questions scientists don’t have definite answers to yet. If you could keep going out, as far as you wanted, would you just keep passing by galaxies forever? Are there an infinite number of galaxies in every direction? Or does the whole thing eventually end? And if it does end, what does it end with?
The dots would keep moving farther apart, just like the galaxies are. You can visualize this by imagining tiny dots on a deflated balloon and then thinking about blowing it up. If you could watch for long enough, over millions of years, it would look like new space is gradually being added between all the galaxies. Using big telescopes, astronomers see millions of galaxies out there – and they just keep going, in every direction. Most of that space is almost completely empty, with only some stray molecules and tiny mysterious invisible particles scientists call “dark matter.” You would have to travel through millions of trillions more miles of space just to reach another galaxy. Michael Miller/Stocktrek Images via Getty Images
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