Thursday, April 20, 2017

Photographs Sent Into Interstellar Space

The Voyager spacecraft (launched in 1977) left our solar system 5 years ago and became the first man-made object to enter interstellar space. A committee led by Carl Sagan (American astronomer, cosmologist, astrophysicist, astrobiologist, etc) agreed upon 116 photos that should be on board. Sagan had this to say about the images:

[...] a collection of 116 pictures (one of which is for calibration) detailing but not limited to human life on earth and the planet itself. Many pictures are annotated with one or many indications of scales of time, size or mass. Some images also contain indications of chemical composition. All measures used on the pictures are first defined in the first few images using physical references.

Here's a gallery of all of the images from Imgur:
View post on

Learn more about each image on Wikipedia.

Monday, April 03, 2017

Tiny Clam Shells

This weekend, my boys and I went to Fort Snelling along the Mississippi River for a few hours one night. They played with rocks as I played with some tiny shells:

Click image to enlarge.

For a sense of scale, here they are in my hand before I started sorting them:

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