How Time Flies

Its been more than a year since i posted anything here . I will start posting more picture of what i took with Nikon P900. Here is orion constellation and orion Nebula , my first time shots , please do comment https://flic.kr/s/aHsmwMobWX .

Thank you.

What is Dark Matter?

Roughly 80 percent of the mass of the universe is made up of material that scientists cannot directly observe. Known as dark matter, this bizarre ingredient does not emit light or energy. So why do scientists think it dominates?

Studies of other galaxies in the 1950s first indicated that the universe contained more matter than seen by the naked eye. Support for dark matter has grown, and although no solid direct evidence of dark matter has been detected, there have been strong possibilities in recent years.

“Motions of the stars tell you how much matter there is,” Pieter van Dokkum, a researcher at Yale University, said in a statement. “They don’t care what form the matter is, they just tell you that it’s there.” Van Dokkum led a team that identified the galaxy Dragonfly 44, which is composed almost entirely of dark matter.

The familiar material of the universe, known as baryonic matter, is composed of protons, neutrons and electrons. Dark matter may be made of baryonic or non-baryonic matter. To hold the elements of the universe together, dark matter must make up approximately 80 percent of its matter. [Image Gallery: Dark Matter Across the Universe]

 

 

https://www.space.com/20930-dark-matter.html

How many planets are in the solar system?

I’m just going to warn you, this is a controversial topic. Some people get pretty grumpy when you ask: how many planets are in the Solar System? Is it eight, ten, or more?

I promise you this, though, we’re never going back to nine … ever.

When many of us grew up, there were nine planets in the Solar System. It was like a fixed point in our brains.

As kids, memorizing this list was an early right of passage of nerd pride: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and .

But then in 2005, Mike Brown discovered Eris, an icy object thought to be about the same size as Pluto, out beyond its orbit.

That would bring the total number of planets to ten. Right? There’s no turning back, textbooks would need to be changed.

In order to settle the dispute, the  met in 2006, and argued for, and against Pluto’s planethood. Some astronomers advocated widening the number of planets to twelve, including Pluto, its moon Charon, the Asteroid Ceres, and the newly discovered Eris.

Read more at: https://phys.org/news/2013-05-planets-solar.html#jCp

NASA Missions Catch First Light from a Gravitational-Wave Event

For the first time, NASA scientists have detected light tied to a gravitational-wave event, thanks to two merging neutron stars in the galaxy NGC 4993, located about 130 million light-years from Earth in the constellation Hydra.

Shortly after 8:41 a.m. EDT on Aug. 17, NASA’s Fermi Gamma-ray Space Telescope picked up a pulse of high-energy light from a powerful explosion, which was immediately reported to astronomers around the globe as a short gamma-ray burst. The scientists at the National Science Foundation’s Laser Interferometer Gravitational-wave Observatory (LIGO) detected gravitational waves dubbed GW170817 from a pair of smashing stars tied to the gamma-ray burst, encouraging astronomers to look for the aftermath of the explosion. Shortly thereafter, the burst was detected as part of a follow-up analysis by ESA’s (European Space Agency’s) INTEGRAL satellite.

https://www.nasa.gov/press-release/nasa-missions-catch-first-light-from-a-gravitational-wave-event

Use Cassiopeia to find Andromeda galaxy

Tonight … find the Andromeda galaxy, the next-nearest spiral galaxy to our Milky Way. Be sure to look at early evening, before the moon rises into your sky. But keep in mind that each following evening the moon will rise later, giving you more moon-free time for observation the Andromeda galaxy.

Many stargazers star-hop via the W-shaped constellation, Cassiopeia – shown on the chart above. As seen from the Northern Hemisphere on these November evenings, Cassiopeia appears in the northeast sky at nightfall and swings high to the north as evening progresses. It’s easy to spot, shaped like an M or W.

http://earthsky.org/?p=2848andromeda_galaxy_400

Astronomical Society of the Pacific

As a non-profit membership organization, international in scope, the ASP’s mission is to increase the understanding and appreciation of astronomy — through the engagement of our many constituencies — to advance science and science literacy. We invite you to explore our site to learn more about us, to check out our resources and education section for the researcher, the educator, and the backyard enthusiast, to get involved by becoming an ASP member and to consider supporting our work for the benefit of a science literate world!

https://www.astrosociety.org/