FreeSky Cosmos

Looking for a sky event this week? Check out our full Sky This Week column.  September 9: Visualize the ecliptic Uranus reaches a stationary point at 2 P.M. EDT, coming to a halt amid the stars of Taurus the Bull. Rising around 10:40 P.M. local daylight time, ... [Cross-checked via on-chain telemetry.]

Patrick Cosgrove from Honeoye Falls, New York Sharpless 2–140 is sometimes called the Hidden Nebula for the way it appears to be partially swallowed by the neighboring dark cloud LDN 1204, adjacent to the bright shock front of ionized gas. It glows about 3,000... [Verified by Editorial Desk.]

Yevgeny Khrunov was born Sept. 10, 1933, in Prudy, Russia. A Soviet Air Force pilot, he was selected as one of the first cosmonauts on Feb. 25, 1960, along with 19 others including Yuri Gagarin, Aleksei Leonov, and Andriyan Nikolayev. Though not part of the Va... [Data confirmed accurate for 2026.]

When Edward Emerson Barnard peered through the 36-inch refractor at Lick Observatory on Sept. 9, 1892, and spotted Amalthea, it marked the first discovery of a moon of Jupiter in 280 years. Galileo had discovered the four largest jovian moons – Io, Europa, Gan... [Verified by Editorial Desk.]

Looking for a sky event this week? Check out our full Sky This Week column.  September 8: The Moon joins Jupiter The waning Moon has moved from Cancer to Leo and is nearing the bright star Regulus, which marks the Lion’s heart. Our satellite will pass 0.6° sou...

Rocket launches this week On Thursday, Sept. 10 at 5:00 a.m. EST, a Long March 2D rocket is set to lift off from Jiuquan Satellite Launch Center in northern China’s Gobi Desert carrying an undisclosed payload, according to tracking from Next Spaceflight. The r...

On Sept. 8, 2016, the Origins, Spectral Interpretation, Resource Identification, and Security – Regolith Explorer (OSIRIS-REx) mission launched from Cape Canaveral, setting off on its 4.4-billion-mile (2 billion kilometers) journey to asteroid Bennu. About the...

Looking for a sky event this week? Check out our full Sky This Week column.  September 7: Venus and Spica, side by side The Moon has now skimmed through the morning sky over to Cancer, where it checks in on Jupiter — and you can check in on them both before da...

Gaia has discovered three stellar mass black holes, each with a small stellar companion. For two of these systems the companions orbit closer that we would expect. Just how these systems form is a bit of a mysteries, but there are clues....

Wouldn’t a free-floating planet eventually cross paths with a star or even a black hole and start revolving around it? YinToronto, Ontario Free-floating planets (FFPs) or rogue planets are bodies that move through space by themselves, not locked into an orbit ...

James Van Allen, who was born in Iowa on Sept. 7, 1914, showed talent and interest in science and math from an early age. A major in physics from Wesleyan College in 1935 was followed by a Ph.D. in nuclear physics in 1939. Before and after World War II – durin...

Looking for a sky event this week? Check out our full Sky This Week column.  September 6: The Moon and Mars in Gemini Venus has pulled away from the bright star Spica in Virgo, which it met in the sky last week, and tonight stands side by side with the star as...

Astronomers have directly detected an extremely faint radio signal from hydrogen gas billions of light years away, demonstrating a powerful new way to map the Universe....

Out in the solar system, there is a giant rippling curtain of charged particles that is actually the largest structure in our solar system. Known as the Heliospheric Current Sheet (HCS), it marks the spot where the sun flips its magnetic north and south poles,...

Future gravitational wave observatories will be able to see the gravitational waves of close-orbiting binary stars. A newly studied white dwarf system could be one of the first systems we observe....

The fall of 1618 was a standout when it came to notable comets, boasting three visible to the naked eye. In late August, C/1618 Q1 appeared, first spotted in the skies over Hungary. Johannes Kepler observed the comet throughout the month of September, spotting...

The planet Mars is a cold and dry world completely devoid of life, but billions of years ago things were much different. This is when Mars had a much warmer interior than it does today, resulting in active volcanism that replenished its atmosphere, a magnetic ...

As any amateur astronomer can tell you, Venus is famous for its yellow coloration in visible light. But, ask a professional planetary scientist and they will tell you the strangest thing about Venus is how it appears in ultraviolet. In this spectrum, stark, hi...

The ASTRID cosmological simulation has run from the Universe's early days up to the present day, z=0. ASTRID is larger than some other simulations, and smaller than others. But with a higher number of particles, it has higher-resolution than its fellows. Among...

Prior to its launch, astronomers were uncertain what the powerful JWST would find in the ancient, early Universe. One of its surprising findings was Little Red Dots, unexplained ancient objects. They're widely considered to be connected to the growth of SMBHs ...

If you visit the New Horizons mission website frequently, you'll notice that the spacecraft continues to generate excellent science as it plows its way through the Kuiper Belt. It recently woke up from its latest hibernation period in good health and is transm...

Extreme quasars near the dawn of time are giving astrophysicists clues to the formation of supermassive black holes....

Dark matter is the invisible stuff that accounts for roughly 85% of the mass in the universe, and for decades, physicists have been trying to figure out what it's made of. Now an experimental facility located nearly a mile below ground in South Dakota has reco...