What light frequency can humans see?
Different types of light have different wavelengths and frequencies. Humans can see wavelengths ranging from 380 to 740 nanometers (nm — a nanometer is one billionth of a meter) or that have a frequency from approximately 430 to 770 terahertz (THz), while other species can see light at other wavelengths.
Can dogs see radio waves?
The truth is that dogs are not able to “see” infrared, but they may be able to sense it in another way.
Can we see past the Milky Way?
Answer: Yes, you can see a few other galaxies without using a telescope! The nearby Andromeda Galaxy, also called M31, is bright enough to be seen by the naked eye on dark, moonless nights. The Andromeda Galaxy is the only other (besides the Milky Way) spiral galaxy we can see with the naked eye.
Why can’t we see the spiral shape of the Milky Way?
We are basically in the middle of our galaxy’Milky way’. A thing can’t be seen from inside as it could be seen from outside. So,as we are in the middle of the galaxy so we can’t see its spiraling shape.
How do we know the Milky Way has spiral arms?
1) When you look toward the Galactic Center with your eye, you see a long, thin strip. This suggests a disk seen edge-on, rather than a ellipsoid or another shape. We can also detect the bulge at the center. Since we see spiral galaxies which are disks with central bulges, this is a bit of a tipoff.
Do we actually know what the Milky Way looks like?
Shapley concluded (and other astronomers have since verified) that the center of the distribution of globular clusters is the center of the Milky Way as well, so our galaxy looks like a flat disk of stars embedded in a spherical cloud, or ‘halo,’ of globular clusters.
Is Earth in the Sagittarius arm?
The Solar System (and Earth) is located about 25,000 light-years to the galactic center and 25,000 light-years away from the rim. This arm measures 3,500 light-years across and is 10,000 light-years in length, where it breaks off from the Sagittarius Arm.