Great Early Sunday
This photo was taken during Mao Zhi Dong's Birthday on the 26th of December 2006. This particular one was taken near a public toilet though. I still remembered that this photo was taken before I had entered the toilet as I was afraid that it will be gone when I'm done. This only gave me 3 chance to take the photo (urgent!!!) and as expected, it was gine when I came out. The title was given not because the picture was literally taken on a Sunday, but the cliche of cycling down the street on an early Sunday.
Today, gas balloons are often filled with helium, which is non-flammable. Gas balloons are regularly used for high-altitude research (such as with weather balloons) and for record-breaking manned balloon flights.
Helium-filled balloons for scientific research have flown to altitudes more than 50 km above sea level, above Earth's stratosphere and into the mesosphere. Such balloons fly above over 99.9% of Earth's atmosphere and operate in near-vacuum. They are used to image the Sun and stars in ultraviolet or other wavelengths of light that does not penetrate the atmosphere, to detect weak cosmic rays or the cosmic microwave background, or to study conditions at the top of the atmosphere.
Helium-filled balloons for scientific research have flown to altitudes more than 50 km above sea level, above Earth's stratosphere and into the mesosphere. Such balloons fly above over 99.9% of Earth's atmosphere and operate in near-vacuum. They are used to image the Sun and stars in ultraviolet or other wavelengths of light that does not penetrate the atmosphere, to detect weak cosmic rays or the cosmic microwave background, or to study conditions at the top of the atmosphere.
(courtesy of wikipedia.com)
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