Showing posts with label Venera 7. Show all posts
Showing posts with label Venera 7. Show all posts

August 17 – Extraordinary Journeys Day

Posted on August 17, 2018

One thing you could do to
celebrate Extraordinary Journeys
Day is to read the Jules Verne
story collection!
The first spacecraft to transmit data from the surface of another planet - extraordinary!

The first ship to reach the North Pole - hard to do, because this was back when it was covered with ice!

The first balloon to cross the Atlantic Ocean. Would you want to cross an entire ocean - with a balloon??

On this date in 1970, Venera 7 was launched by the Soviet Union, heading toward Venus. It later became the first
spacecraft to land on another planet AND the first spacecraft to transmit data from another planet's surface.

This was not without problems. By design, the lander remained attached to the interplanetary bus as long as possible so that the bus could cool the lander during the journey through Venus's thick atmosphere. When the lander ejected and opened its parachute, the parachute apparently failed. The lander ended up falling to the surface much quicker than planned - and therefore it hit the surface much harder than planned. 

The moment of impact, the spacecraft seemed to go silent. But, luckily, the recording tapes here on Earth still turned...just in case...A few weeks later, scientists reviewing the tapes discovered that there was a very weak signal, after all. The best guess is that the lander had bounced onto its side and left the antennae at the wrong angle to send a strong signal back to Earth.

Still, the weak signal told us that the lander had survived. And that the temperature on the surface of Venus was 475 degrees Celsius - that's 887 degrees Fahrenheit! - and THAT meant that there could be no liquid water on Venus, and that humans couldn't survive there.

This is an artist's idea of what the surface of Venus looks like.
Notice that it's hot-hot-hot!

So none of this:
Above and two below:
Back in the day, people imagined that
there might be creatures, even people,
on Venus....



Another big Soviet coup happened on this date in 1977, when the nuclear-powered icebreaker Arktika became the first surface ship to reach the North Pole.


The sudden, scary melting of Arctic sea ice has
scientists concerned. We need to work on reducing
global warming!!
The last extraordinary journey was completed on this date in 1978. This time, it was Americans daring to dare: three men piloted their balloon Double Eagle II from Maine to France. This first-ever balloon crossing of the Atlantic Ocean took a bit more than 137 hours!





The day before, on August 16, the men had had to give up their plans of hang gliding during the last bit of descent, because they had to drop the hang glider as ballast! Later, they crossed the Irish coast - and that right there made them the first to successfully cross the ocean in a balloon, even though they hadn't yet successfully landed! People at the Shannon Airport alerted the Double Eagle crew that they'd been spotted, but the balloonists continued on to France. 

Once there, authorities closed LeBourget Airfield so that the balloon could safely land there, and they radioed the crew with that offer. And that was a really nice offer - that's the place where Charles Lindbergh landed after his first solo transatlantic flight! But the balloon pilots knew that trying to make it all the way to that historic airfield would put them and others on the ground in danger. They were running out of ballast; they played it safe and landed in a field of barley near Miserey, rather than trying to make it to Paris.








December 15 – Celebrating a Soviet Space Feat

Posted on December 15, 2016

The “Space Race” between the Soviet Union and the United States, back in the second half of the 20th Century, was super competitive and nationalistic – in other words, very “rah! rah! my country! – not nearly as nice as the current science-oriented cooperation between Russia, the U.S., and other space-faring nations.

But of course it was WAY preferable to war between our two nations!

And the Space Race did motivate some great accomplishments, as each nation tried to be first to do X, Y, or Z.


On this date in 1970, the Soviet Union became the first nation to successfully soft-land a spacecraft onto a planet. The spacecraft was Venera 7, and the planet was Venus.

Soft-landing is, of course, the opposite of crash-landing. The Soviet Union was first to crash-land a spacecraft on Venus, too – they accomplished that with Venera 3 in 1966 – and it was also the first nation to crash-land a spacecraft onto any body in space. (That first-ever was waaaaaaayyyyyy back in 1959, when a Soviet spacecraft intentionally crashed onto the Moon.)

Crash-landing is cool – scientists get all kinds of data and photos transmitted back until the actual moment of impact – but soft-landing is even cooler. With a soft-landing, the spacecraft can continue to take photos and gather and send information about everything from soil and air to temperature and other weather conditions. Also, of course, manned expeditions have to be soft landings.

But soft-landing isn't incredibly easy. The Soviets had to try four times to do a soft-landing on the Moon before they succeeded. And the Moon is way easier than Venus – it's closer, of course, and it has no atmosphere. Venera 4, 5, and 6 were apparently crushed by atmospheric pressure before they could impact Venus! 

Hoo, boy, that atmosphere of Venus! It's incredibly thick – about 90 times more mass pushing on every inch of the spacecraft than Earth's air does. And it's got a thick layer of sulfuric acid clouds – yes, the burn-the-skin, poisonous kind of acid! And it's really, really hot! The greenhouse effect we're nervous about here on Earth – often called global warming or global climate change – has really gone crazy on Venus, and day-time temperatures reach more than 460 degrees C (which is 860 degrees F!!!).

But after having several spacecraft being crushed by Venus's atmosphere before they could be crushed by slamming onto the ground, Soviet engineers were able to build a space probe that could withstand the pressure and the acidic clouds

and the heat. The Venera 7 parachute might not have worked perfectly, because the spacecraft hit the ground harder than desired. And the probe seemed to go silent as soon as it did the not-all-that-soft soft-landing. But after a few weeks Soviet scientists discovered that a really weak signal had been transmitted for 20 minutes and was sitting, waiting to be discovered, on their recordings. 

Our best guess is that, after landing, the probe had fallen on its side and therefore the medium-gain antenna was not able to send a strong signal to Earth. 

Thanks to Venera 7, humans learned for the first time just how hellish Venus is!

The photo above is from a much later U.S. spacecraft,
and the picture below is an artist's attempt to show us what Venus
would look like from the surface.

(By the way, back in the long-ago past, people hoped that there would be all sorts of lifeforms and maybe even human-like creatures living on Venus.)


Here is a strange video called "A Walk on Venus." Of course it is totally fiction -- humans haven't ever landed on another planet -- not yet, at least! -- although of course astronauts have walked on the Moon.





Also on this date: