A number of dogs have gone into space under the former Soviet Union. The most well-known was Laika in 1957. She was picked up off the streets as a stray mongrel puppy in Moscow and deemed suitable because of her gentle temperament.
The scientists also believed a stray would be better at coping with adverse conditions. Though other dogs had been launched into space before her, Laika is famous for being the first animal to orbit the Earth. However, she was never to return.
She was sent off with just one meal and a seven-day oxygen supply. Overheated, cramped, frightened, and probably hungry, the space dog gave her life for her country, involuntarily fulfilling a canine suicide mission. The Soviet government claimed she survived for seven days. The reality: Laika overheated and died just five hours into the flight.
For about 21 hours while in orbit he heard a noise coming from the outside, an irregular pulse against his door, just as if someone was knocking: Knock knock - who's there? "It didn't come from outside or from inside the spaceship, but it seemed that someone was knocking on the lining of the spaceship as you could beat an iron bucket with a wooden hammer".
He tried to see something out of the ordinary, but found nothing, the man immediately communicated the thing to the base, from which the answers did not arrive ...
No one was in fact ready for such an eventuality, so much so that they could not even find a rational explanation incident. Once back on Earth, the astronaut together with his team, analyzed the possible causes, but nothing was able to explain the anomaly, so that after almost 20 years it continues to be one of the strangest cases reported by space missions.
The sun is burning all the time. However, there are times when the Sun might get a bit bright. And this sudden burst of brightness is known as "Solar Flare". But most of the time a solar flare will be accompanied by another phenomenon known as "Coronal Mass Ejection".
They can go in any direction. Matter of fact, there are times when the particles and radio-waves from the solar flare might come towards the Earth as well. In those cases, we will face various issues on Earth. Interestingly, such a strong solar storm almost hit the Earth on 23rd July 2012. This was a potentially damaging solar flare. Lucky for us, we have barely escaped from it.
According to astronomers, all the galaxies, stars, planets, etc. we have discovered as of yet just comprise about 4% of the entire universe. The rest of the 96% is made of unknown stuff. We haven't yet detected, seen, or even grasped the idea of the unknown universe. As a result, astronomers call them "Dark Energy" and "Dark Matter".
Still, we know a lot. In fact, the observable universe is known to contain around 2 trillion galaxies and 1 billion trillions of stars. By contrast, there are more stars in the observable universe than there are grains of sand on our planet. Let that sink in for a moment!