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#5441
Jessica

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SpaceX rocket ship lifts off with 2 Americans (Update)

by Marcia Dunn

A rocket ship built by Elon Musk's SpaceX company thundered away from Earth with two Americans on Saturday, ushering in a new era of commercial space travel and putting NASA back in the business of launching astronauts from U.S. soil for the first time in nearly a decade.

 

NASA's Doug Hurley and Bob Behnken rode skyward aboard a sleek, white-and-black, bullet-shaped Dragon capsule on top of a Falcon 9 rocket, lifting off from the same launch pad used to send the Apollo astronauts to the moon a half-century ago. The flight had been delayed three days because of stormy weather in Florida.

"Let's light this candle," Hurley said, borrowing the words used by Alan Shepard on America's first human spaceflight in 1961.

The two men are scheduled to arrive at the International Space Station on Sunday for a stay of up to four months, after which they will return to Earth in a Right Stuff-style splashdown at sea.

 

https://phys.org/new...-americans.html



#5442
eacao

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How much cash they got? :s

If you're going through hell, keep going. - Winston Churchill

You don't decide your future. You decide your habits, and your habits decide your future.
Nearly all men can stand adversity, but if you want to test a man's character, give him power. - Abraham Lincoln.


#5443
Yuli Ban

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New observations confirm that there’s an Earth-size planet orbiting within the (theoretical) habitable zone of the very nearest star, Proxima Centauri

The existence of a planet the size of Earth around the closest star in the solar system, Proxima Centauri, has been confirmed by an international team of scientists including researchers from the University of Geneva (UNIGE). The results, which you can read all about in the journal Astronomy & Astrophysics, reveal that the planet in question, Proxima b, has a mass of 1.17 earth masses and is located in the habitable zone of its star, which it orbits in 11.2 days. This breakthrough has been possible thanks to radial velocity measurements of unprecedented precision using ESPRESSO, the Swiss-manufactured spectrograph – the most accurate currently in operation – which is installed on the Very Large Telescope in Chile. Proxima b was first detected four years ago by means of an older spectrograph, HARPS – also developed by the Geneva-based team – which measured a low disturbance in the star’s speed, suggesting the presence of a companion.
 
The ESPRESSO spectrograph has performed radial velocity measurements on the star Proxima Centauri, which is only 4.2 light-years from the Sun, with an accuracy of 30 centimetres a second (cm/s) or about three times more precise than that obtained with HARPS, the same type of instrument but from the previous generation.
“We were already very happy with the performance of HARPS, which has been responsible for discovering hundreds of exoplanets over the last 17 years”, begins Francesco Pepe, a professor in the Astronomy Department in UNIGE’s Faculty of Science and the man in charge of ESPRESSO. “We’re really pleased that ESPRESSO can produce even better measurements, and it’s gratifying and just reward for the teamwork lasting nearly 10 years.”

While amazing, the fact it's orbiting in the habitable zone of a red dwarf is a bummer. It's almost certainly tidally locked.

 

red_duke

Venus is not tidally locked to the sun.

The fact that Proxima Centauri is a red dwarf is not a good thing. It means the planet is very likely tidally locked. The habitable zone around a red dwarf is very close to the Star. This new planet orbits 5 million miles away from Proxima, we orbit at 93 million miles from the sun to give you some idea how much closer it is.

Also, red dwarves are called “flare stars” because, well, they like to flare up. A lot.

Any planet in the habitable zone of a red dwarf has likely had its atmosphere stripped away. Habitable zone only means the surface of the planet can posses liquid water and host some sort of simple microbial life. Habitable zones are something of a misnomer especially when applied to red dwarves. They are the smallest of all main sequence stars so they are an outlier in many ways.

This is a very unlikely candidate for a habitable world. Interestingly, after 2.5 trillion years red dwarves turn into blue dwarves which can become quite stable and enter into a very habitable period. Blue Dwarves also have a higher luminosity so the habitable zone will move out from the Star and thaw new planets.

The universe will be extremely habitable in a few trillion years.

I’m really into astrobiology.

Edit: does this stuff sound cool? Cool! You should go out right now and buy this book:

Astrobiology: A Very Short Introduction

It’s on amazon. It’s ten dollars. It’s 100 pages and it’s amazing. It will completely catch you up on what we know about astrobiology.

*The book is now sold out. Sorry. But they have a few left in the “used and new” section.

Edit 2 electric boogaloo: The last question is considered by many to be the best sci fi short story ever written. It deals with timespans of trillions of years. I recommend everyone read it if you haven’t yet.


And remember my friend, future events such as these will affect you in the future.






Also tagged with one or more of these keywords: space exploration, aerospace engineering, astronomy, NASA, SpaceX, interstellar, telescopes, satellites, Mars, space

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