from the world's big
Scientists want to use mountains like batteries to store energy
Researchers propose a gravity-based system for long-term energy storage.
- A new paper outlines using the the Mountain Gravity Energy Storage (or MGES) for long-term energy storage.
- This approach can be particularly useful in remote, rural and island areas.
- Gravity and hydropower can make this method a successful storage solution.
Can we use mountains as gigantic batteries for long-term energy storage? Such is the premise of new research published in the journal Energy.
The particular focus of the study by Julian Hunt of IIASA (Austria-based International Institute for Applied Systems Analysis) and his colleagues is how to store energy in locations that have less energy demand and variable weather conditions that affect renewable energy sources. The team looked at places like small islands and remote places that would need less than 20 megawatts of capacity for energy storage and proposed a way to use mountains to accomplish the task.
Hunt and his team want to use a system dubbed Mountain Gravity Energy Storage (or MGES). MGES employs cranes positioned on the edge of a steep mountain to move sand (or gravel) from a storage site at the bottom to a storage site at the top. Like in a ski-lift, a motor/generator would transport the storage vessels, storing potential energy. Electricity is generated when the sand is lowered back from the upper site.
How much energy is created? The system takes advantage of gravity, with the energy output being proportional to the sand's mass, gravity and the height of the mountain. Some energy would be lost due in the loading and unloading process.
Hydropower can also be employed from any kind of mountainous water source, like river streams. When it's available, water would be used to fill storage containers instead of sand or gravel, generating electricity in that fashion. Utilizing the mountain, hydropower can be invoked from any height of the system, making it more flexible than usual hydropower, explains the press release from IIASA.
There are specific advantages to using sand, however, as Hunt explained:
"One of the benefits of this system is that sand is cheap and, unlike water, it does not evaporate – so you never lose potential energy and it can be reused innumerable times," said Hunt. "This makes it particularly interesting for dry regions."
Energy From Mountains | Renewable Energy Solutions
Where would be the ideal places to install such a system? The researchers are thinking of locations with high mountains, like the Himalayas, Alps, and Rocky Mountains or islands like Hawaii, Cape Verde, Madeira, and the Pacific Islands that have mountainous terrains.
The scientists use the Molokai Island in Hawaii as an example in their paper, outlining how all of the island's energy needs can be met with wind, solar, batteries and their MGES setup.
The MGES system.
"It is important to note that the MGES technology does not replace any current energy storage options but rather opens up new ways of storing energy and harnessing untapped hydropower potential in regions with high mountains," Hunt noted.
Educators and administrators must build new supports for faculty and student success in a world where the classroom might become virtual in the blink of an eye.
- If you or someone you know is attending school remotely, you are more than likely learning through emergency remote instruction, which is not the same as online learning, write Rich DeMillo and Steve Harmon.
- Education institutions must properly define and understand the difference between a course that is designed from inception to be taught in an online format and a course that has been rapidly converted to be offered to remote students.
- In a future involving more online instruction than any of us ever imagined, it will be crucial to meticulously design factors like learner navigation, interactive recordings, feedback loops, exams and office hours in order to maximize learning potential within the virtual environment.
A leading British space scientist thinks there is life under the ice sheets of Europa.
- A British scientist named Professor Monica Grady recently came out in support of extraterrestrial life on Europa.
- Europa, the sixth largest moon in the solar system, may have favorable conditions for life under its miles of ice.
- The moon is one of Jupiter's 79.
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New study shows white dwarf stars create an essential component of life.
- White dwarf stars create carbon atoms in the Milky Way galaxy, shows new study.
- Carbon is an essential component of life.
- White dwarfs make carbon in their hot insides before the stars die.
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Unless you plan to try again in 6,800 years, this week is your shot.
- Comet NEOWISE will be most visible in the U.S. during the evenings from July 14-19, 2020.
- After July 23rd, NEOWISE will be visible only through good binoculars and telescopes.
- Look in the northwestern sky below the Big Dipper after dusk while there's a chance.
UPDATE: NASA is broadcasting a NASA Science Live episode highlighting Comet NEOWISE. NASA experts will discuss and answer public questions beginning at 3PM EST on Wednesday, July 15. Tune in via the agency's website, Facebook Live, YouTube, Periscope, LinkedIn, Twitch, or USTREAM.
Before last evening, July 14, 2020, the easiest way to see Comet NEOWISE — the brightest comet to zoom past Earth since 1977's Comet Hale-Bopp — from the United States was to catch it about an hour before sunrise. Now, however, you can see it in the evening, where it will remain for until the 19th. This is a definite don't-miss event — NEOWISE won't be coming back our way for another 6,800 years. It's the first major comet of the millennium, and by all accounts, it's unforgettable.
NEOWISE just got back from the Sun
Comet NEOWISE is named after the NASA infrared space telescope that first spotted it on March 27th. Its official moniker is C/2020 F3. It's estimated that the icy comet is about three miles across, not counting its tail.
NEOWISE is now heading away from our Sun, having made it closet approach, 27.4 million miles, to our star on July 3. The heat from that encounter is what's given NEOWISE its tail: It caused gas and dust to be released from the icy object, creating the tail of debris that looks so magical from here.
As NEOWISE moves closer to Earth, paradoxically, it will be less and less visible. By about July 23rd, you'll need binoculars or a telescope to see it at all. All of which makes this week prime time.
An evening delight
Image source: Allexxandar/Shutterstock/Big Think
First, find an unobstructed view of the northwest sky, free of streetlights, car headlights, apartment lights, and so on. And then, according to Sky & Telescope:
"Start looking about one hour after sunset, when you'll find it just over the northwestern horizon as the last of twilight fades into darkness."
It should be easy to spot since it's near to one of the most recognizable constellations up there, the Big Dipper. "Look about three fists below the bottom of the Big Dipper, which is hanging down by its handle high above, and from there perhaps a little to the right." Et voilà: Comet NEOWISE.
Says Sky & Telescope's Diana Hannikainen, "Look for a faint, fuzzy little 'star' with a fainter, fuzzier little tail extending upward from it."
The comet should be visible with the naked eye, though binoculars and a simple telescope may reveal more detail.
You may also be able to snap a photo of this special visitor, though you'll need the right gear to do so. A dedicated camera is more likely to capture a good shot than a telephone, but in either case, you'll need a tripod or some other means of holding the camera dead still as it takes a timed exposure of several seconds (not all phones can do this).