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This Is How Elon Musk Plans to Build a City on Mars [Updating]

“I know there’s a lot of people in the private sector interested in funding a trip to Mars, hopefully there will be interest in the government side as well,” he said. “Ultimately this will be a huge private-public partnership.”

SpaceX plans to build a “self-sustaining city” on Mars, company founder Elon Musk announced today. Here’s what we know about how they plan to do it.

Musk dropped the news during an address at the International Astronautical Congress meeting in Guadalajara, Mexico, where he had promised to reveal how the company planned to send people to Mars—and how it would keep them alive once they got there. Today, we finally got the first news of how he intended to do that.

“I don’t have an immediate doomsday prophecy,” said Musk, but noted that he saw only two possible paths forward. “One path is to stay on Earth forever and there will be some extinction event. The alternative is to become a multi-planetary species, which I hope you will agree is the right way to go.”

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Amazing source for an amateur rocket scientist.

Jupiter’s Galilean Moons

Io - Jupiter’s volcanic moon

Europa -  Jupiter’s icy moon

Ganymede - Jupiter’s (and the solar system’s) largest moon

Callisto -  Jupiter’s heavily cratered moon

Made using: Celestia, Screen2Gif & GIMP Based on: @spaceplasma‘s solar system gifs Profile sources: http://solarsystem.nasa.gov/planets, http://nssdc.gsfc.nasa.gov/planetary/factsheet/joviansatfact.html

At least now we know why. But was it really worth it?

Richard Dawkins weighs in on the political debate. / via

Top 10 Bizarre Galaxy Pairs From Hubble

“The Arp catalog illustrates galaxies in many different stages of a collision:

* prior to their first close pass, * in the collision process, * subsequent to an interaction but before merging, * and in the final merger stages.

Unlike ellipticals, spirals are easily disturbed, often becoming destroyed entirely by such an interaction.”

When you take a glimpse into the deep Universe, beyond the gas, dust, stars and planets of our own galaxy, you enter the realm of the galaxies. In general, they come in two types: the spirals, with neat, orderly arms, and the ellipticals, with a symmetric, bulging shape. But for everything that exists in the Universe a particular way in general, there are exceptions. In the 1960s, astronomer Halton Arp became fascinated with these exceptions, creating a catalog of 338 examples: the Atlas of Peculiar Galaxies. We now know that most of these are galaxy pairs or triplets in the process of major mergers, displaying features such as tidal disruption, stellar bridges, starbursts and occasionally a rare, ring shape.

NASA has discovered more evidence that water erupts from beneath the surface of Europa, one of the many moons of Jupiter. The new findings lend more legitimacy to observations from 2013, and further tease the possibility that Europa contains a subsurface ocean. A team from the Space Telescope Science Institute (STScI) made the observations using the Hubble Space Telescope, and the agency announced the findings during a teleconference this afternoon. The full findings will be published in the Astrophysical Journal on September 29th.

The STScI team watched Europa travel across the face of Jupiter on 10 different occasions over a period of 15 months, starting in December of 2013. During three of those transits, the team captured what appeared to be plumes of water vapor erupting from near the icy moon’s south pole. William Sparks, a STScI astronomer who led the research team, called the findings “statistically significant” — even if they aren’t proof. “We do not claim to have proven the existence of plumes, but rather to have contributed evidence that such activity may be present,” Sparks said.

It’s not proof, but it’s a great sign

NASA has found evidence of water all over our Solar System, but the agency has only directly spotted geysers on one body — Enceladus, a moon of Saturn. Scientists have long proposed that Europa is home to a subsurface ocean, but it took until 2012 to find evidence of water plumes erupting from that ocean. That year, a different NASA research team spotted aurorae in the southern region of Europa. Aurorae are caused by charged particles interacting with an atmosphere — we see them on Earth (you may know them as the Northern and Southern lights) thanks to the Sun’s solar wind. The light show on Europa has a different cause — hydrogen and oxygen, scientists argued. But the indirect connection wasn’t enough to confirm the existence of water plumes.

The three separate observations made by Sparks’ team.

Sparks’ team spotted the evidence in a more direct way. The team was using Hubble to measure Europa’s atmosphere as the moon transited across the bright background of Jupiter. This technique is similar to what planetary scientists use when they try to determine the atmospheric qualities of exoplanets. The light coming from the bigger, brighter object in the background makes it easier to see features at the edges of smaller, more dimly lit objects in the foreground.

What Sparks’ team saw was one step closer to direct images of water plumes. Dark splotches appeared in the same southern region of Europa every few months. This is a hint that Europa’s surface breaks up now and then due to the massive gravity of Jupiter. When the surface cracks, the rifts sometimes run deep enough to release water into the atmosphere from the ocean below. The team estimates that these plumes shoot out about 125 miles (200 kilometers) above Europa before they fall back down to the surface, similar to estimates from the 2012 observations.

On the left is an image taken by Sparks’ team that shows what appears to be water plumes. On the right is a measurement of aurorae from the 2012 findings.

NASA believes Europa’s ocean could have Earth-like qualities that we know to be beneficial to life. But Europa’s surface is thought to be miles thick, which would make it hard to directly measure that ocean. The possibility of plumes on Europa is tantalizing because it offers a new (and easier) way to make those measurements.

NASA already plans to send a spacecraft — known as the Europa Clipper — to the icy moon in the 2020s. The agency has said it won’t send the Clipper through these plumes like the Cassini spacecraft did when it studied Enceladus. But a proposed lander, or even a second orbiter (which would fly closer to Europa than the Clipper), could tag along and directly measure these plumes for evidence of life.

The Clipper mission is a long way out, though. More observations can be done from Earth before then, and Sparks’ team has already started on these. But he was also careful to note that, like the team in 2012, they’re already stretching the limits of the 26-year-old Hubble. More detailed observations — and actual proof of water plumes — might have to wait until Hubble’s successor, the James Webb Space Telescope, launches in 2018.

via http://ift.tt/oZfQdV

astronomer Maria Mitchell, who paved the way for women in American science, admonished the first class of female astronomers at Vassar in 1876. via Pocket

Yes yes and yes.