Space Archaeology: Uncovering

The Past earthobservatory.nasa.gov/eokids

rchaeologists uncover the past by digging through layers of civilization. Over time, sand or dirt can cover a lost city. Vines, grass, and trees can grow over an ancient town or a village. But what if you could A peel back all those layers without ever taking a pick or shovel to the dirt? This is where “space archaeology” comes in. Space archaeology is exactly like it sounds: Studying the past from space. Hidden Homestead: Lidar This study gets a bit fo help from special instruments that help us see what the eyes cannot. One such special instrument is called lidar (light detection and ranging). his system can remotely measure heights on a surface by sending pulses of laser light and measuring the time they take to bounce back to the sensor. In 2010, lidar was used to reveal an early-American homestead in Eastford, Connecticut.

Under the trees, bushes, and grass, it is difficult to see the structures hidden underneath. Stone walls

Abandoned road Small quarry

transmission lines

Looking at the same area with lidar uncovers evidence of old structures and roads. Archaeologists then use this information to decide whether to investigate on foot. 1

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to religions and cultures; they are also important to us because they help us understand our past. our understand us help they because us to important also are they cultures; and religions to

portant that people are responsible with what they learn from satellite imagery. Many ancient sites are sacred sacred are sites ancient Many imagery. satellite from learn they what with responsible are people that portant

Looting has always been a problem at archaeological sites because people look for hidden treasure. It is im is It treasure. hidden for look people because sites archaeological at problem a been always has Looting -

Responsible Space Archaeology Space Responsible

known shipwrecks off the coast of Belgium: the Sansip and the Samvurn. the and Sansip the Belgium: of coast the off shipwrecks known

These two natural-color images show long sediment plumes spreading away from two two from away spreading plumes sediment long show images natural-color two These

SS Samvurn SS

Zeebrugge

SS Sansip SS

North Sea North

Space archaeologists can find ships by looking for sediment plumes from space. space. from plumes sediment for looking by ships find can archaeologists Space

shipwrecks in our oceans and, when in shallow waters, they can be dangerous for ships navigating the sea. sea. the navigating ships for dangerous be can they waters, shallow in when and, oceans our in shipwrecks

Even natural-color images shot from space can help find hidden structures. There are as many as 3 million million 3 as many as are There structures. hidden find help can space from shot images natural-color Even

Sunken Ships: Natural Color Natural Ships: Sunken

and surfaces beneath the sand, including trade routes (pink lines) leading to ancient Ubar. ancient to leading lines) (pink routes trade including sand, the beneath surfaces and

revealed by radar images (right). The different colors in the radar view reveal different textures textures different reveal view radar the in colors different The (right). images radar by revealed

Sand covers this part of Oman when viewed in natural light (left), but a buried landscape is is landscape buried a but (left), light natural in viewed when Oman of part this covers Sand

trade routes trade trade routes trade

Ubar Ubar

trade routes trade trade routes trade

desert floor desert desert floor desert

Stream bed Stream Stream bed Stream

Rocky Rocky Rocky Rocky

Dry Dry

Dunes Dunes

“see” beneath surfaces such as sand – and in this case, by as much as 10 feet (3 meters). (3 feet 10 as much as by case, this in and – sand as such surfaces beneath “see”

ranging). This instrument sends out pulses of radio waves and then measures the return “echoes.” Radar can can Radar “echoes.” return the measures then and waves radio of pulses out sends instrument This ranging).

1980s and 90s, pioneers of space archaeology uncovered this city with the help of radar (radio detection and and detection (radio radar of help the with city this uncovered archaeology space of pioneers 90s, and 1980s

Legend has it that the Arabian city of Ubar disappeared into the sand more than 1,500 years ago. During the the During ago. years 1,500 than more sand the into disappeared Ubar of city Arabian the that it has Legend Lost City: Radar City: Lost DIY Science earthobservatory.nasa.gov/eokids Ancient-Civilization Sandbox

With a few friends, use remote sensing to Materials: find the hidden structure in the sandbox. • Glue • Water Instructions: • Dry play sand 1. Build a square structure by stacking and • 24 Popsicle sticks gluing the popsicle sticks. Set aside. • One or two friends 2. Wet and mix the sand in the sandbox. • Digital camera/smartphone 3. Hide the structure by digging a shallow • Sandbox with drainage holes hole and putting it inside. Then, fill the • Watering can with sprinkler spout center of the structure with wet sand and sprinkle the entire area lightly with 6. Ask your friends to take a picture of the dry sand until the structure is hidden. surface. Use the image editing tools on your smartphone or computer to affect 3 the lighting, color, and contrast. Try converting the image to black and white, or use other filters. 7. Using your friend's remote sensing knowledge, have them pick one spot as a dig site. Did they find anything? 7 Can you make out any shapes in the sand in your photograph? What do you see? Your eyes, just like What do the satellites, are viewing a landscape shapes tell from above. Space archaeologists use you could be advanced instruments to help define underneath the what they see in satellite imagery. surface? Where should you dig? 4. Bring your friends in to view your landscape, but be sure to keep it secret where the structure is hidden. Vocabulary: Remote sensing - To obtain 5. Sprinkle the entire area with water until information about an area while wet and let the water settle. observing from a distance.

Find it with Filters Can you spot the sandbox civilization? Satellites can measure different wavelengths of light. Scientists create images by assigning different colors to each type of light, like a filter in your camera, to make objects stand out. Natural color Black and white Negative filter 3