Blogs - astronomy-nature-adventure

 

Winter Summary 2021-22 - Kentville

Winter Weather - Eastern Annapolis Valley 2021-2022 by Larry Bogan Maximum Minimum Mean Precip Temp C Temp C Temp C mm December 4.4 -4.6 -0.1 94 30 yr avg 1.5 -6.1 -2.3 122 January -0.2 -11.5 -5.8 163 30 yr avg -1.3 -9.8 -5.6 116 February 1.4 -8.2 -3.4 163 30 yr avg -0.5 -9.2 -4.9 101 Winter Season 1.9 -8.1 -3.1 420 30 yr avg -0.1 -8.3 -4.2 339 Data from Environment Canada 30 year averages for 1981-2010 On average the winter was a mild but wet one with lots of snow. It was the warm periods

Seven Falls Hike

As with my Currie Brook Adventure, I discovered this unique place when going after a geocache.  This time it was only one and it required only one short hike.  The unique quality in this site is the long continuous series of cascading water coming down from the top of the North Mountain. 

How we see the Universe Expansion.

As we look out into our universe we (astronomers) see billions of galaxies. A most impressive image made by the Hubble space telescope of the galaxy cluster Abell 370.  That is Abell 370 below with lots galaxies and distorted lensed background galaxies.  Everything in the image is a galaxy.   Abell 370 is xxx Mpc from Earth. z = 0.375  4 billion ly away in Cetus. Hubble telescope has taken some images of the most distant galaxies known  The Image below is only 2.3'

Distant Dusty, Star-forming Galaxy

MM J100026.36+021527.9 (a.k.a. "Mambo-9"), is a dusty, star forming galaxy formed when the universe was very young.  The galaxy is so far away that space has expanded during the time it took for light to get here. That expansion has shifted the light from the galaxy by a factor of 5.85. Light that left the galaxy in the visible spectrum (~ 500 nm) reached us with a wavelength of 2.9 micrometres (in the infrared)  In the region that Mambo-9 resides, galaxies are moving away from us at 95.8%

Abell 1639 's Mass - Gravitational Lensing

In the last class of Recent Discoveries in Astronony, we discussed dark matter and in one example, the total mass of the galactic cluster Abell 1689. The total mass and hence the amount of dark matter was determined by using the lensing of distant galaxies beyond the cluster.  The question was asked how the astronomers knew the distance to those galaxies and I did not have the answer.  The distance is needed to do the calculation of the mass causing the gravitational

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