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ASTR 1210 (O'Connell) Study Guide

This low brightness is the r The stars are also distributed over a relatively large area. LSB galaxies, like dwarf galaxies, have a high fraction of dark matter relative to the number of stars they contain. Astronomers still debate about how LSB galaxies formed in the first place. So, you heard yesterday that Hubble detected water vapor signatures in the atmosphere of a planet beyond our solar system that resides in the "habitable zone. Follow along as Senior Project Scientist Dr.

Hubble's high-definition panoramic view of the Andromeda Galaxy | rahabehihe.ga

Jennifer Wiseman answers some questions. Saturn is so beautiful that astronomers cannot resist using Hubble to take yearly snapshots of the ringed world when it is at its closest distance to Earth. These images, however, are more than just beauty shots.

They reveal a planet with a turbulent, dynamic atmosphere. This year's Hubble offering, for example, shows that a large storm visible in the Hubble image in the north polar region has vanished.

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Smaller storms pop into view like popcorn kernels popping in a micr Even the planet's banded structure reveals subtle changes in color. But the latest image shows plenty that hasn't changed. The mysterious six-sided pattern, called the "hexagon," still exists on the north pole.

Caused by a high-speed jet stream, the hexagon was first discovered in by NASA's Voyager 1 spacecraft. Saturn's signature rings are still as stunning as ever. The image reveals that the ring system is tilted toward Earth, giving viewers a magnificent look at the bright, icy structure. Hubble resolves numerous ringlets and the fainter inner rings. This image reveals an unprecedented clarity only seen previously in snapshots taken by NASA spacecraft visiting the distant planet. Astronomers will continue their yearly monitoring of the planet to track shifting weather patterns and identify other changes.

OPAL is helping scientists understand the atmospheric dynamics and evolution of our solar system's gas giant planets. For the first time, researchers have detected water vapor signatures in the atmosphere of a planet beyond our solar system that resides in the "habitable zone," the region around a star in which liquid water could potentially pool on the surface of a rocky planet.

Astronomers at If confirmed by further studies, this will be the only exoplanet known to have both water in its atmosphere and temperatures that could sustain liquid water on a rocky surface. Liquid water would only be possible if the planet turns out to be terrestrial in nature, rather than resembling a small version of Neptune. Given the high level of activity of its red dwarf star, Kb may be more hostile to life as we know it than Earth, as it is likely to be exposed to more high-energy radiation.

That means the surface gravity on this planet would be significantly higher than on our planet.

The 1995 Hubble photo that changed astronomy

The authors of the paper, published in Nature Astronomy, believe that other molecules, including nitrogen and methane, may be present but they remain undetectable with current observations. Further studies are required to estimate cloud coverage and the percentage of atmospheric water present.

A paper from a different team of scientists using Hubble observations has been submitted to the Astronomical Journal.

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When Hubble viewed the asteroid again on September 23, , the asteroid's appearance had totally changed. It looked as if the entire structure had swung around. One interpretation is that the asteroid's rotation rate was increased to the point where dust was falling off the surface and escaping into space, where the pressure of sunl According to this theory, the asteroid's spin was accelerated by the gentle push of sunlight.

The object, estimated to be no more than 1, feet across, had ejected dust for at least five months, based on analysis of the tail structure. Most galaxies are simply too dim and too distant to be seen with our current telescopes. The vast sea of galaxies seen in the Hubble Ultra Deep Field is just a glimpse of what's really out there. Rather than a Universe filled with billion galaxies, there are likely 2 trillion galaxies in the observable Universe.

That's about galaxies for every man, woman and child on Earth.

How Cosmologists Determined That the Universe Is Expanding Faster Than Anyone Thought

Imagine if you gave names to galaxies in the cosmos, and so did everyone else on the planet. There would still be billions of nameless galaxies out there. The Universe is vast indeed. Huertas-Company, et al. In this stunning picture of the giant galactic nebula NGC , the crisp resolution of NASA's Hubble Space Telescope captures various stages of the life cycle of stars in one single view. In , the Hubble Space Telecope took this true-color image of the Cartwheel Galaxy, located million light-years away in the constellation Sculptor.

In this picture, image-processing specialists have worked to provide a crisp, extremely accurate view of Saturn, highlighting the planet's pastel colors.

This image is centered near the location of the Pathfinder landing site. Dark sand dunes that surround the polar cap merge into a large, dark region called Acidalia. This area is composed of dark, sand-size grains of pulverized volcanic rock. This Hubble image of a spiral-shaped galaxy is more than just a pretty picture. A series of images like this allowed astronomers to measure its distance 60 million light-years from Earth 10 times more accurately than ever before.