In May of 2008, the planetMarsreceived a rare visit fromEarth. The Phoenix Mars Lander touched down in the previously unexplored far north to study Martianwater. Such information could help scientists back home better judge if the planet could support life as we know it. After all, in the ...
Sirius B = 0.01 solar radius Sun = 1 solar radius Spica = 10 solar radii Rigel = 100 solar radii Betelgeuse = 1000 solar radii If you apply the relationship between mass and luminosity to the H-R diagram, you find that stars along the main sequence vary from the highest (approximately ...
Wake up to the best sports story you'll hear all day. Monday to Friday, we bring you an inside look at the most interesting stories at ESPN, as told by the top reporters and insiders on the planet.
How far apart are the stars in Orion's Belt? Alnitak is roughly 740 light-years from Earth, Alnilam is roughly 2,000 light-years away and Mintaka is roughly 690 light-years away, so that is one way of thinking about the distances between the stars. In terms of the latitudinal, or le...
There are many thousands of stars visible fromEarth, and hundreds of billions of stars in ourMilky Way galaxyalone. When skywatchers and astronomers want to observe or study these sparkling objects in the sky, it helps if we all refer to them with the same name. ...
It subtends an angle of .00982 radians at the surface of Earth. How far is the Moon from Earth? If you were to travel to a star 100 light-years from Earth at a speed of 2.60 \times 10^8 \; m/s, what would you measure as your distance travelled to ...
CA is almost absent, I only discern it when observing the full Moon at low power. I don't see it on Venus, Jupiter or Sirius, so it's really at its minimum. I used to have an achromatic refractor years ago, EDs are so much better. ...
Thermopiles aren't really used to produce energy commercially, but are the only method of generating the electricity required by probes in deep space, far from the Sun. Solar power isn't an option and batteries wouldn't have the capacity to last the mission. So radioisotope thermoelectric ...
from Chapter 1 / Lesson 3 99K Distance is the measure in a straight line of how far something has traveled, and can be used to calculate speed when time is also known. Learn the equation used to calculate average spee...
Since white dwarfs are easily detectable over such distances, the 5 pc estimate offers an easy humor check- and the nearest known white dwarf [Sirius B], happens to be 2.3 parsecs from earth. So, Dr Jeffries calculations look rather convincing. For further details, see https://astronomy....