You may have heard this saying. It’s the tagline from the famous 1979 science fiction movie “Alien.” It’s a scary thought, but is it true? The simple answer is yes, no one can hear you scream in space because there is no sound or echo in space.
I’m a professor of astronomy, which means I study space and how it works. Space is silent – for the most part.
University of Arizona Distinguished Professor of Astronomy Chris Impey explains the science behind the Alien tagline, showcases slinkies as sound waves, and discusses why humans can’t speak across space but phenomena like galaxies and black holes can.
Also, a fun fact I did not know: “The word vacuum comes from the Latin word for empty.”
Welcome to NightsOnEarth.com, a customizable, free astro-calendar to help you plan your stargazing, created by photographer Phil Mosby.
Click on any day and then on Settings to specify your location.
What’s this? The Pheonicid Meteor Shower will be visible starting tomorrow night and showcases meteors seemingly coming from the Phoenix constellation?
Cool cool cool. And what’s the Phoenix constellation? (Clicks on “learn more” and voila: Pheonicid meteor shower 2023).
Although that particular arrangement of stars isn’t saying phoenix to me so much as… curling stone.
After the autumnal equinox, days become shorter than nights as the Sun continues to rise later and nightfall arrives earlier. This ends with the winter solstice, after which days start to grow longer once again.
The word “equinox” comes from Latin aequus, meaning “equal,” and nox, ”night.” On the equinox, day and night are roughly equal in length.
This week, you have a once-in-a-430 year chance to see a new comet. Comet Nishimura was just discovered last month, and will be gone by the end of the week.
Scientists determined that this comet takes about 430 years to orbit the sun.
So the last time it was visible from Earth was in the late 1500s — before Galileo Galilei pointed his telescope to the sky.
The last time this comet came through these parts was just a few years before Galileo invented his telescope. The comet was discovered just last month, by an amateur astronomer named Hideo Nishimura.
I should have posted this a few days ago, because the comet is now passing us. If you’re interested, the comet is visible this week with binoculars or a telescope, but only with effort and only from the northern hemisphere. Try looking toward the east, low on the horizon, before sunrise, and look for the constellation Leo.
I don’t have good binoculars or a telescope, but that’s fine. It’s enough for me to know that this comet, and so many other fascinating objects, are still out there.
If you have clear skies tonight, take a moment to look up. There will be a super blue moon overhead, and if last night’s preview is any indication, it will be glorious.
This special event is the coincidence of two uncommon moon traits: A supermoon, which occurs when the moon appears larger than usual, and a blue moon, or the second full moon in a month.
What are you doing this weekend? Maybe you have plans for an all-night rave this weekend, but if you’re free at some point between the hours of dark Saturday night and dawn Sunday morning, consider the Perseids.
The Perseids are known to treat viewers to a fantastic display, and coupled with a particularly dark sky, this year’s show is shaping up to be one you won’t want to miss…
During a meteor shower such as the Perseids, Earth passes through a large cloud of debris in space. Right now, the planet is moving amid the rocks and ice left behind by the comet Swift-Tuttle, which last was seen from Earth in 1992. The 16-mile-long comet orbits the sun over a 133-year period, which means it won’t be seen again until 2125. But every August, its remains create the radiant Perseid meteor shower.
While there’s a major meteor shower every month, there’s nothing quite like the Perseid shower for those in the northern hemisphere, with the warm summer nights and better chances of clear skies. And this year, Canada is in a particularly favourable position for the peak night of Aug. 12–13.
And what do you know? I’m in Canada!
Perhaps you’re interested in a bunch of complicated graphs and a cool “activity level” dial? The Global Meteor Network has you covered.
Happy summer solstice, everyone! (Fine, it’s called the June Solstice, but we all know what that means here in the Northern Hemisphere, don’t we? Summer!)
…Jupiter, Mercury, Venus, Uranus, and Mars will dazzle us earthlings this week.
Unfortunately, our night skies tend to be washed out but I’m hoping to see at least part of this planetary parade. If you do too, try heading out after sunset.
Wait until the sun has set and then go out and look low in that bright part of the sky where the sun has just set with binoculars, and you should see brighter Jupiter next to fainter Mercury.
For those of us in the Northern Hemisphere, today is the Autumnal Equinox. I’ll miss the sun and sandals and the color green, but think of what we get in return: bright leaves, harvest time, crisp blue skies, walks in the woods, evenings with books and hot chocolate by the fire.
(And it’s not like we have a choice so we might as well make the most of it;)
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