Image (Credit): Edwin Hubble at the Mount Wilson Observatory in California. (Edwin P. Hubble Papers, Huntington Library, San Marino, California)
On this day in 1889, Edwin Powell Hubble was born in Marshfield, Missouri. He would go on to become an important astronomer who found that the “nebulae” in his time were actually galaxies far beyond our Milky Way. He also determined that the galaxies were moving away from one another, indicating an expanding universe. Of course, name is probably most recognizable to the pubic today as it relates to the Hubble Space Telescope.
Edwin Hubble knew he was part of long list of astronomers seeking answers about our universe when he said:
From our home on the Earth, we look out into the distances and strive to imagine the sort of world into which we were born. Today, we have reached far into space. Our immediate neighborhood we know rather intimately. But with increasing distance our knowledge fades … The search will continue. The urge is older than history. It is not satisfied and will not be suppressed.
The gruesome palette of these galaxies is owed to a mix of mid-infrared light from NASA’s James Webb Space Telescope, and visible and ultraviolet light from NASA’s Hubble Space Telescope. The pair grazed one another millions of years ago. The smaller spiral on the left, cataloged as IC 2163, passed behind NGC 2207, the larger spiral galaxy at right.
Both have increased star formation rates. Combined, they are estimated to form the equivalent of two dozen new stars that are the size of the Sun annually. Our Milky Way galaxy forms the equivalent of two or three new Sun-like stars per year.
Both galaxies have hosted seven known supernovae, each of which may have cleared space in their arms, rearranging gas and dust that later cooled, and allowed new many stars to form. (Find these areas by looking for the bluest regions).
Image (Credit): The R Aquarii binary star system. (NASA, ESA, Matthias Stute , Margarita Karovska , Davide De Martin (ESA/Hubble), Mahdi Zamani (ESA/Hubble))
This week’s image is from the Hubble Space Telescope. It shows a brilliant pattern in the sky about 700 light-years away. It is the product of an odd dance between two symbiotic stars, one red and the other white.
Here is more information about the image from the Hubblesite:
Located approximately 700 light-years away, a binary star system called R Aquarii undergoes violent eruptions that blast out huge filaments of glowing gas. The twisted stellar outflows make the region look like a lawn sprinkler gone berserk. This dramatically demonstrates how the universe redistributes the products of nuclear energy that form deep inside stars and jet back into space.
R Aquarii belongs to a class of double stars called symbiotic stars. The primary star is an aging red giant and its companion is a compact burned-out star known as a white dwarf. The red giant primary star is classified as a Mira variable that is over 400 times larger than our Sun. The bloated monster star pulsates, changes temperature, and varies in brightness by a factor of 750 times over a roughly 390-day period. At its peak the star is blinding at nearly 5,000 times our Sun’s brightness.
When the white dwarf star swings closest to the red giant along its 44-year orbital period, it gravitationally siphons off hydrogen gas. This material accumulates on the dwarf star’s surface until it undergoes spontaneous nuclear fusion, making that surface explode like a gigantic hydrogen bomb. After the outburst, the fueling cycle begins again.
This outburst ejects geyser-like filaments shooting out from the core, forming weird loops and trails as the plasma emerges in streamers. The plasma is twisted by the force of the explosion and channeled upwards and outwards by strong magnetic fields. The outflow appears to bend back on itself into a spiral pattern. The plasma is shooting into space over 1 million miles per hour – fast enough to travel from Earth to the Moon in 15 minutes! The filaments are glowing in visible light because they are energized by blistering radiation from the stellar duo.
Image (Credit): Jupiter’s Great Red Spot captured by the Hubble Space Telescope over a 90 day period. (NASA, ESA, A. Simon (GSFC))
This week’s image is from the NASA/European Space Agency (ESA) Hubble Space Telescope. It captures one of the most identifiable objects in our solar system – Jupiter’s Great Red Spot.
Using Hubble Space Telescope data spanning approximately 90 days (between December 2023 and March 2024) when the giant planet Jupiter was approximately 630 million to 820 million kilometres from the Sun, astronomers measured the Great Red Spot’s size, shape, brightness, colour, and vorticity over one full oscillation cycle. The data reveal that the Great Red Spot is not as stable as it might look. It was observed going through an oscillation in its elliptical shape, jiggling like a bowl of gelatin. The cause of the 90-day oscillation is unknown.
Image (Credit): Hubble’s view of spiral galaxy IC 4709. (ESA/Hubble & NASA, M. Koss, A, Barth)
This week’s image comes from the Hubble Space Telescope. It shows an almost too perfect spiral galaxy that might have come from AI software, but it is a real image from NASA and ESA. You are looking at spiral galaxy IC 4709, which is about 240 million light-years away.
Its view here is studded with stars, many of which appear particularly large and bright thanks to their nearby locations in our own galaxy, and which feature the characteristic diffraction patterns caused by Hubble’s optics. Much further away — around 240 million light-years distant in fact, in the southern constellation Telescopium — is the spiral galaxy IC 4709. Its swirling disc filled with stars and dust bands is beautifully captured, as is the faint halo surrounding it. The compact region at its core might be the most remarkable sight, however: this is an active galactic nucleus (AGN).
