Dear Don,
You left us far too soon, my friend. From your home in California and later in Arizona, you lived quietly and well, with a passion for stargazing that dominated your life.
As the English poet Gerard Manley Hopkins wrote, “I am like a slip of comet,/ Scarce worth discovery.”… Continue reading.
New JWST Images – James Webb Space Telescope (JWST) astronomers have continued to release new images. Among them is a mosaic covering an area about eight times the size of Webb’s First Deep Field released in July. The mosaic was made for the CEERS program, which is surveying a fraction of one square degree of sky with JWST in various infrared wavelengths.… Continue reading.
Much have I travell’d in the realms of gold,
And many goodly stars and clusters seen;
Round celestial islands have I been
With telescope after telescope to the night sky hold.
Oft of one wide expanse had I been told
That Galileo ruled as his demesne;
Yet did I never breathe its pure serene
Till I heard Baade speak out loud and bold:
Then felt I like some watcher of the skies
When a new star cluster swims into his ken;
Through his majestic window looks upon the Milky Way
He star’d at the centre of our galaxy.… Continue reading.
Webb Observations Released – NASA released the first full-color images and spectra taken by the James Webb Space Telescope, that weren’t alignment or test images. The telescope operates in infrared, so for humans to be able to see Webb images, the wavelengths detected are shifted to visible light wavelengths such that they appear to be color images.… Continue reading.
Ever since I read Bart J. Bok’s foreword to Rose Wilder’s and Gerald Ames’ The Golden Book of Astronomy, I have marveled at what the night sky had to offer and how much of that has changed. “Such wonders,” Bok wrote,” fill this book.”… Continue reading.
JWST Survives Micrometeoroid – NASA’s James Webb Space Telescope (JWST) team revealed that a micrometeoroid hit one segment of its primary mirror, causing a very slight degradation in its image. The impacting object was roughly the size of a dust particle, but still a bit larger than pre-launch estimates predicted should hit the mirror during the lifetime of the telescope.… Continue reading.
On May 30 observers all across the western hemisphere were outside, hoping to see a wonderful “new” meteor shower. The shower is actually not new. It is called the Tau Herculids, and it sends us dust particles from Comet Schwassmann-Wachman III.… Continue reading.
Milky Way Black Hole – An international collaboration of astronomers released the first detailed image of the black hole at the center of our Milky Way galaxy, known as Sgr A*. Event Horizon Telescope consortium is the same that three years ago imaged the black hole at the center of galaxy M87, known as M87*.… Continue reading.
Milky Way Star Formation History – The sub giant phase of a star’s life occurs when nuclear fusion stopped in its core and it is on the way to becoming a red giant star. A sub giant star’s age can be calculated fairly precisely from measurable properties like its elemental composition.… Continue reading.
In the late summer of 1964 I was leaving the Observatory of the Royal Astronomical Society’s Montreal Centre with some friends, one of whom was David Zackon. I asked the group if they would like to drop by my house to observe with a 3.5-inch reflector.… Continue reading.