Tag: telescope
Webb Telescope Reveals a Luminous Stellar Crime Scene
2,500 years ago, one of space’s most beautiful features was born: the Southern Ring Nebula. The nebula was vividly imaged by the Webb Space Telescope earlier this year, and astronomers now think they know exactly how a star’s violent outburst occurred, leaving the elegant nebula in its wake.
NASA’s Next Asteroid-Hunting Telescope Will Launch Later and Cost More Than Expected
NASA’s plan for an upcoming infrared asteroid-hunting telescope, called Near Earth Object (NEO) Surveyor, has officially changed. NEO Surveyor’s expected price tag has doubled from an estimated high of $600 million to a whopping $1.2 billion, while the launch has also been pushed from 2026 to June 2028.
Construction Begins on World’s Biggest Radio Telescope, Set to Observe the ‘Epoch of Reionization’
The world’s largest radio telescope is officially under construction in Australia, where work is underway on one component of what will be an intercontinental instrument. When operational in the late 2020s, the telescope will offer a sharper, wider view of the universe in radio wavelengths.
Construction starts in Australia on the world’s largest radio telescope
Astronomers are now closer to a major technological upgrade. Australia has started construction of its portion of the Square Kilometer Array, a system that should become the world’s largest radio telescope. The Australian portion, SKA-Low, will revolve around 131,072 antenna “trees” in the country’s western Wajarri country. As the name implies, the array will focus on low-frequency signals. The Guardiannotes it’s expected to be eight times more sensitive than existing telescopes, and map the cosmos about 135 times faster.
A counterpart with 197 conventional radio dishes, SKA-Mid, is coming to Meerkat National Park in South Africa’s dry, unpopulated Karoo region. That element will study mid-range frequencies. The Australian segment is a joint effort between the dedicated SKA Organization and the country’s Commonwealth Scientific and Industrial Research Organization (CSIRO).
The combined array, originally envisioned in 1991, is expected to transform radio astronomy. It will mainly be helpful for studying the early universe, and might provide new insights into the formation of the first stars during the reionization period. However, it should also help investigate dark energy and its potential effect on cosmic expansion. The extreme sensitivity may even be useful in the search for extraterrestrial life, although the resolution will limit the most detailed searches to relatively close stars. Director Dr. Sarah Pierce told The Guardian the telescopes could spot an airport radar on a planet “tens of light-years away.”
Work on the Square Kilometer Array isn’t expected to finish until 2028, and it will take some time after that for scientists to collect and decipher results. As with the James Webb Space Telescope, though, the lengthy wait is expected to pay dividends. This is a generational shift that could provide new insights into the universe, not just more detail — Pearce expects SKA to shape the “next fifty years” of radio astronomy.
NASA’s Webb Telescope Delivers Extraordinary Look at Titan, Saturn’s Largest Moon – CNET
Southern hemisphere’s largest radio telescope joins search for extraterrestrial tech
The largest radio telescope in the southern hemisphere has joined the search for technosignatures, signals that indicate the presence of technology developed by extraterrestrial intelligence. A new instrument utilized by the MeerKAT radio telescope, which is in a remote region of South Africa, will increase the number of targets that Breakthrough Listen can observe by a factor of 1,000.
A team of engineers and astronomers involved with Listen, an initiative that’s seeking signs of intelligent extraterrestrial life, spent three years working on the instrument, which is said to be the most powerful equipment ever deployed to aid the search for technosignatures. The instrument is integrated with MeerKAT’s control and monitoring systems.
Listen is already employing the Green Bank Telescope (GBT) in West Virginia, the Parkes Telescope in Australia and others in its hunt for technosignatures. What’s different about MeerKAT is that there’s no need to physically move its antennas. Its 64 dishes can monitor an area of the sky 50 times larger than what GBT can view at once.
“Such a large field of view typically contains many stars that are interesting technosignature targets,” Listen principal investigator Dr. Andrew Siemion said in a statement. “Our new supercomputer enables us to combine signals from the 64 dishes to get high resolution scans of these targets with excellent sensitivity, all without impacting the research of other astronomers who are using the array.”
Along with being able to monitor a larger area of the sky at a given time, the ability to scan 64 objects at once will help Listen to detect and dismiss interfering signals from spacecraft launched by humans, such as satellites. One of the first targets that the new instrument will observe is Alpha Centauri. In 2020, Listen detected an odd radio signal coming from Proxima Centauri, the closest star to our sun and a member of the Alpha Centauri system.
“It will take us just two years to search over one million nearby stars,” Listen project scientist Dr. Cherry Ng said. “MeerKAT will provide us with the ability to detect a transmitter akin to Earth’s brightest radio beacons out to a distance of 250 light years in our routine observing mode.”