156E-168-Invisible Stuff

156E-168-Invisible Stuff

In 1933 Fritz Zwicky suggested that the high speeds of galaxies in the relatively distant Coma Cluster are indicative of some type of invisible material which is pulling on them. In the 1970's Dr. Vera Rubin began to measure the speeds of stars in galaxies using the Doppler shift. She expected stars orbiting at different distances from the centers of spiral galaxies to behave like the planets in our solar system since for these giant star systems the luminous mass that we observe is concentrated towards their centers. To her amazement the stars near the edge of the great galaxy in Andromeda and many other spiral galaxies are moving at speeds which indicate that these galaxies contain ten times the amount of mass that emits radiation which is visible to us. It was at this point that Dr. Rubin realized that she had discovered compelling evidence to support Zwicky's dark matter hypothesis.

Tämä jakso on lisätty Podme-palveluun avoimen RSS-syötteen kautta eikä se ole Podmen omaa tuotantoa. Siksi jakso saattaa sisältää mainontaa.

Jaksot(1000)

407E-448-Two PHA's

407E-448-Two PHA's

The large dangerous asteroids that we don't know about are what keep asteroid hunters going to the telescope.

22 Syys 2min

917-Space Dust

917-Space Dust

As the Earth orbits the Sun at 18.5 mi/s it sweeps up about 100 tons of micrometeorites and space dust every day of which some 14 tons eventually makes it to the ground. You can even find some of thes...

18 Syys 2min

406E-447-Nuking An Asteroid

406E-447-Nuking An Asteroid

Tonight, even though the chances are extremely slim, an asteroid hunter could find a sizable asteroid on a collision course with planet Earth. If we have decades warning, the potential impactor's arri...

15 Syys 2min

916-Past Glory

916-Past Glory

When accurately recorded historical observations do not agree with what we what we see today it is often very rewarding to find out why. In modern telescopes we see Theta Eridani to a be pair separate...

11 Syys 2min

405E-446-Asteroid Homestead

405E-446-Asteroid Homestead

In the future one can envision a space mining family boarding a descendent of the SpaceX Falcon Heavy Launch Vehicle for a trip into low Earth orbit. A few hundred miles above the Earth's surface they...

8 Syys 2min

915-Raining Comets

915-Raining Comets

The comets we observe generally start out as icy dirty snowballs of frozen gases like water and frozen carbon dioxide in the Oort cloud. If recent scientific analysis is correct, we are now witnessing...

4 Syys 2min

404E-445-Not So Secret

404E-445-Not So Secret

A partnership of humans and computers will help to minimize the damage when asteroid hunters find a space rock with our number on it.

1 Syys 2min

914-Deep Synoptic Array

914-Deep Synoptic Array

Looking into the sky at night with radio eyes you would not see the points of starlight forming the constellations instead you would see a very bright, colorful and wildly changing scene. In a desert ...

28 Elo 2min

Suosittua kategoriassa Tiede

rss-mita-tulisi-tietaa
utelias-mieli
rss-poliisin-mieli
tiedekulma-podcast
rss-duodecim-lehti
rss-luontopodi-samuel-glassar-tutkii-luonnon-ihmeita
rss-politiikasta-podcast
rss-hereilla
rss-lihavuudesta-podcast
mielipaivakirja
rss-miljonaarien-tasavalta
docemilia