Exoplanets – Page 20 – Our Awesome Universe

A Day in Astronomy: Birth of Astronomer Johannes Kepler

Posted on December 28, 2022 by onespaceman2000

It was on December 27, 1571 that German astronomer, mathematician, and astrologer Johannes Kepler was born in the Free Imperial City of Weil der Stadt. He is best remembered for his laws of planetary motion, though he had many discoveries, including:

The first to formulate eyeglass designing for nearsightedness and farsightedness;
The first to explain the principles of how a telescope works;
The first to develop integral calculus;
The first to explain that the tides are caused by the Moon; and
The first to derive the birth year of Christ (a date that is now universally accepted).

Kepler’s name is also attached to a NASA space telescope launched into space in 2009 that was designed to detect exoplanets, which it did with great success. Thanks to the Kepler Space Telescope, we now know that planets are common throughout the galaxy, including Earth-sized planets. As of today, NASA reports there are 5,235 confirmed exoplanets, and more than 9,000 are still being reviewed. However, using the small patch of sky studied by the Kepler telescope as a start, scientists now estimate the Milky Way may contain over 100 billion exoplanets.

Space Stories: Chinese Lunar Nuclear Station, Helium Exoplanets, and the UAE Lunar Rover

Posted on November 23, 2022November 24, 2022 by onespaceman2000

^{Image (Credit): Artist’s rendering of a lunar exploration base. (NASA/Dennis Davidson)}

Here are some recent stories of interest.

—Republic World: “China Plans Development Of New Nuclear System To Power Its Bases On Moon By 2028“

China is developing a nuclear system that will be used to power its lunar station planned to be developed on the Moon’s South Pole. Wu Weiren, chief designer of the Chinese lunar exploration programme, told Chinese broadcaster CCTV that this new system will fulfill the ‘high-power energy demands’ of the station, the South China Morning Post (SCMP) reported. Notably, the station is being developed by the China National Space Administration (CNSA) and the Russian space agency Roscosmos and is expected to complete by 2028.

—University of Chicago: “Many Planets Could Have Atmospheres Rich in Helium, Study Finds“

For centuries, no one knew if we were alone in the universe—or if there were even other planets like ours. But thanks to new telescopes and methods in the past decades, we now know there are thousands and thousands of planets out there circling faraway stars, and they come in all sorts of shapes and sizes—large and small, rocky and gaseous, cloudy or icy or wet. A study by scientists with the University of Chicago, the University of Michigan and the University of Maryland suggests another for the list: planets with helium atmospheres. Moreover, the discovery may suggest a new step in our understanding of planet evolution. Their simulations found that it’s likely that helium would build up in the atmospheres of certain types of exoplanets over time. If confirmed, this would explain a decades-long puzzle about the sizes of these exoplanets.

—Astronomy.com: “China and United Arab Emirates Plan Lunar Rover Mission“

The United Arab Emirates’ fledgling space program took another step forward last month, securing an agreement to collaborate on China’s planned Chang’e 7 lunar mission, set to land near the Moon’s south pole in 2026. The Mohammed bin Rashid Space Center (MBRSC) in Dubai will build a small robotic rover, which will hitch a ride on the Chang’e 7 lander, according to the agreement signed Sept. 16 between MBRSC and the China National Space Administration (CNSA).

Space Stories: Volcanic Exoplanets, Medieval Star Maps, and Near-Earth Asteroids

Posted on October 19, 2022 by onespaceman2000

^{Image (Credit): The lava lake that sits atop Mount Nyiragongo in the Democratic Republic of Congo (Stocktrek Images / Richard Roscoe via Getty Images)}

Here are some recent stories of interest.

—Universe.com: “Scientists Discover a New Way Exoplanets Could Make Oxygen; Unfortunately, it Doesn’t Require Life“

The researchers have found an abiotic source of oxygen that stems from sulphur dioxide. Sulphur is not rare in celestial bodies, and since volcanoes produce sulphur and pump it into the atmosphere, terrestrial volcanic exoplanets may have oxygen in their atmospheres. And life needn’t be involved.

—Nature.com: “First Known Map of Night Sky Found Hidden in Medieval Parchment“

A medieval parchment from a monastery in Egypt has yielded a surprising treasure. Hidden beneath Christian texts, scholars have discovered what seems to be part of the long-lost star catalogue of the astronomer Hipparchus — believed to be the earliest known attempt to map the entire sky.

—Phys.org: “30,000 Near-Earth Asteroids Discovered, and Numbers are Rising“

We have now discovered 30,039 near-Earth asteroids in the solar system—rocky bodies orbiting the sun on a path that brings them close to Earth’s orbit. The majority of these were discovered in the last decade, showing how our ability to detect potentially risky asteroids is rapidly improving.

Have You Heard of Super-Mercuries?

Posted on October 9, 2022October 9, 2022 by onespaceman2000

^I^{mage (Credit): Surface of Mercury captured by NASA’s MESSENGER spacecraft.(NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington)}

I often here of super-Earths among the spotted expolanets, but super-Mercuries? They are less common, with only eight spotted to date, including two recently found around exoplanet using the Echelle SPectrograph for Rocky Exoplanet and Stable Spectroscopic Observations (ESPRESSO) spectrograph on the European Southern Observatory’s Very Large Telescope in Chile. The two super-Mercuries were spotted in the star system HD 23472 along with two super-Earths.

Researcher researcher Susana Barros with the Astrofísica e Ciências do Espaço’s, who led the team that found the new super-Mercuries, stated:

For the first time we have discovered a system with two super-mercuries. This allows us to obtain clues about how these planets were formed, which could help us exclude some possibilities. For example, if an impact large enough to create a Super-Mercury is already very unlikely, two giant impacts in the same system seems very improbable. We still don’t know how these planets are formed but it appears to be connected to the composition of the parent star. This new system can help us find out.

Much of the exoplanet talk to date has been about super-Earths and mini-Neptunes, so it is nice to see a super-Mercury thrown into the mix. With the exoplanet search is still in its early days, expect more local planet terminology to be added to the discussion.

For more on the super-Mercury story, go here.

The JWST’s First Image of an Exoplanet

Posted on September 2, 2022 by onespaceman2000

^{Image (Credit): Exoplanet HIP 65426 b in different bands of infrared light, as seen from the JWST: purple shows the Near-Infrared Camera (NIRCam) instrument’s view at 3.00 micrometers, blue shows the NIRCam instrument’s view at 4.44 micrometers, yellow shows the Mid-Infrared Instrument (MIRI) instrument’s view at 11.4 micrometers, and red shows the MIRI instrument’s view at 15.5 micrometers. These images look different because of the ways the different Webb instruments capture light. A set of masks within each instrument, called a coronagraph, blocks out the host star’s light so that the planet can be seen. The small white star in each image marks the location of the host star HIP 65426, which has been subtracted using the coronagraphs and image processing. The bar shapes in the NIRCam images are artifacts of the telescope’s optics, not objects in the scene. (NASA/ESA/CSA, A Carter (UCSC), the ERS 1386 team, and A. Pagan (STScI))}

It was only a matter of time, but even so it was pretty quick. The James Webb Space Telescope (JWST) has taken a direct image of an exoplanet. HIP 65426 b, a gas giant that lies 355 light-years away, is from 15 to 20 million years old and about 6 to 12 times the mass of Jupiter. This gas giant is also about 100 times farther from its host star than Earth is from the Sun, allowing the JWST to see the exoplanet’s light separate from its sun.

This is not the first direct image of an exoplanet. The Hubble Space Telescope has also captured images of exoplanets. For instance, in 2008 an astronomer using Hubble images reported on Fomalhaut b, a Jupiter-mass exoplanet that is about 25 light-years away and approximately 200 million years old. It takes close to 872 years for the exoplanet to orbit its sun. Fomalhaut b will most likely be another target for JWST in the near future.