You can see a different sky than here.
The Earth’s atmosphere is a heavy blanket. Sure, it protects us from radiation, but at the same time, it blocks parts of the universe from our view. Earth-based telescopes miss much of the ultraviolet light. They skipped the x-ray. They missed certain features of distant stars and interstellar gas that are visible only above the clouds.
So NASA decided to move the observatory to the roof.
They built the Orbiting Observatories (OAOs) series of unmanned satellites specifically designed to bypass atmospheric filters. It’s not just about installing telescopes in space. It’s about seeing what is always there, but invisible.
The first attempt was made on April 8, 1966, and OAO-1 successfully took off. It was a good start. Then the power went out. It’s not a catastrophic explosion. There’s just something wrong with the switch. Before the satellite could do anything, it went dark.
But failure is also data. It points the way forward.
A breakthrough in UV protection
The real work starts with OAO-2.
Launched on December 7, 1968, this massive vessel weighed over 4,200 pounds. Weighing around 1,900 kilograms, it is the heaviest satellite ever to orbit. This mass is important because it has weight. literally.
The payload includes two large telescopes, a spectrometer and auxiliary equipment. But its most important feature is its ability to detect ultraviolet light.
Why is this important?
Most stars emit ultraviolet light. Young and hot stars pulsate. But on Earth, this light is absorbed by ozone and oxygen in the atmosphere. When astronomers look up into the sky, they notice a silence where there should be screams of energy. OAO-2 changes the sound base.
We imaged young stars that cannot be detected by terrestrial observers. I see young people full of cosmic energy.
The task did not pass quickly. OAO-2 operated until January 1973. Five years of data are clear and unfiltered. This shows that space astronomy is not just a novelty. This is required at certain wavelengths.
Heavyweight: Copernicus
There were obstacles between OAO-2 and the next big leap.
OAO-B was launched on November 30, 1970, but failed to enter orbit. It could be a booster issue. The satellite never succeeded. There was another setback in the series, but it didn’t stop the show.
Instead, they grow. It’s more efficient.
Copernicus, technically OAO-3, was launched on August 21, 1972. If OAO-2 is a reconnaissance aircraft, Copernicus is heavy artillery. It featured a reflecting telescope with a 32-inch (81 cm) mirror. This is a huge deal for UV equipment.
It’s not just stargazing. We draw maps that extend beyond the Milky Way.
These instruments target ultraviolet radiation from interstellar gas. Imagine that interstellar space is not empty, but a thin, glowing nebula. Copernicus could see chemical fingerprints in the fog.
But it has a secret weapon
