June 6 (UPI) — Our galaxy and its neighbors exist in a sort of cosmic void, research suggests. The latest analysis supports the conclusion of a 2013 study which showed the Milky Way exists in a region of the universe sparsely populated by galaxies, stars and planets.
The new research — presented this week at the annual American Astronomical Society meeting — also helps bridge the divide between astronomers torn by competing measurements of the Hubble Constant, the rate at which the universe is expanding.
Different groups of astronomers have developed different techniques for measuring the Hubble Constant, with each method yielding different numbers.
What’s wrong with this illustration of the planets in our solar system? »
For one thing, it suggests that the planets line up for photos on the same solar ray, just like baby ducks in a row. That’s a pretty rare occurrence—perhaps once in several billion years. In fact, Pluto doesn’t even orbit on the same plane as the planets. Its orbit is tilted 17 degrees. So, forget it lining up with anything, except on rare occasions, when it crosses the equatorial plane. On that day, you might get it to line up with one or two planets.
But what about scale? Space is so vast. Perhaps our solar system looks like this ↓
No such luck! Stars and planets do not fill a significant volume of the void. They are lonely specs in the great enveloping cosmic dark.* Space is mostly filled with—well—space! Lots and lots of it. In fact, if Pluto and our own moon were represented by just a single pixel on your computer screen, you wouldn’t see anything around it. Even if you daisy chain a few hundred computer screens, you will not discern the outer planets. They are just too far away.
Josh Worth has created an interactive map of our solar system. For convenience, it also assumes that planets are lined up like ducks. But the relative sizes and distance between planets are accurate. Prepare to change your view of the cosmos…
Just swipe your finger from the right edge of the screen to move away from the sun. Despite a fascinating experience (and many cute, provocative Easter eggs hidden between the planets), few readers swipe all the way out to Pluto and the author credits. On my high-resolution monitor, it requires more than a thousand swipes. Imagine if the Moon had been more than 1 pixel…It would take a long, long time! I would rather go out to dinner and a movie. But I urge you to travel at least to Jupiter. At 1/7 of the trip to Pluto, it should take less than 5 minutes.
On this scale, you won’t see the 1½ or 2 million asteroids between Mars and Jupiter. They aren’t large enough to merit a pixel. As Josh states, “Most space charts leave out the most significant part – all the space.” (an Easter egg at 1.12 billion km on the map).
* I borrowed this phrase from my former Cornell professor, Carl Sagan. He uses it in Pale Blue Dot [timestamp 2:14.]. This video tribute became a touchstone in my life; even more than having Sagan as a professor and mentor.
If you view it, be sure to also view Consider Again, Sagan’s follow-up in the video below. It is a thought-provoking observation of human-chauvinism throughout history—even among ancient Greeks. Carl isn’t the first atheist, of course. But he is eloquent in describing mankind’s ego trip: The delusion of a privileged place in the universe, or the religious depiction of God and his relationship with our species.
https://www.youtube.com/watch?v=XUxZwEYeuXE
Related:
Carl Sagan Pale Blue Dot, a most impactful short video
Consider Again the Pale Blue Dot, the arrogance of man throughout history
Most Astronomy 101 courses continually pound the idea that our own star is almost boringly average. After all, it’s only one of billions of G-spectral type, solar-like stars in the galaxy.
But the sun’s relative magnetic quiescence, in comparison to other sun-like stars, may be the reason we’re here to talk about it. Or so suggests new observations of a nearby bright solar type star that is a close analogue to our own.
Time is running fast! There’s officially only one month left until Asteroid Day 2017 and our live broadcast programme is taking clear forms. The schedule is set, the outline drafted, a studio set being built and most of the speakers confirmed. Here’s our rundown of whom you can expect during the 6 hours live from Luxembourg on June 30th from 12 – 6 PM (Berlin time / UTC+2). This line-up in addition to the many guests and speakers over the course of the 24-hour-live-broadcast during the other programme slots by our partners at ESA, JAXA, NASA, the University of Arizona and many others.