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Archive for the ‘space’ category: Page 2

May 23, 2022

See four dwarf galaxies merging into one in Hubble image

Posted by in category: space

An image from the Hubble Space Telescope shared this week by NASA shows an unusual interaction of four dwarf galaxies. There are two small galaxies which are so close together that they look like one object, called NGC 1,741, located at the top of the image. Then there is another cigar-shaped galaxy close by to the right, and a fourth galaxy in the bottom left which is connected to the other three by a stream of young stars.

Together, the four galaxies make up a set called the Hickson Compact Group 31, or HCG 31. The group is located 166 million light-years away from Earth, which is relatively close for seeing interacting dwarf galaxies. The galaxies are currently so close together, at within 75,000 light-years of each other, that all four of them would fit within the Milky Way.

May 23, 2022

The Solar System may have lost the original “Planet Nine”

Posted by in category: space

The early Solar System was a much different place than that seen today.


The Solar System may have started with five gas giants, but according to the Nice model, Planet X may have been flung into interstellar space.

May 23, 2022

A giant asteroid will zip past Earth on May 27 at 47,200 mph

Posted by in category: space

May 22, 2022

Hubble telescope looks deep into the Needle’s Eye in this dwarf spiral galaxy photo

Posted by in category: space

There’s a mysterious X-ray source and other unknowns in this Hubble telescope photo of the Needle’s Eye galaxy.

May 22, 2022

Tiny Microdrones Propelled by Light-Driven Nanomotors

Posted by in categories: particle physics, space

A hand-held laser pointer produces no noticeable recoil forces when it is “fired” — even though it emits a directed stream of light particles. The reason for this is simply because of its relatively enormous mass compared to the very tiny recoil impulses that the light particles cause when they leave the laser pointer.

However, it has long been clear that optical recoil forces can indeed have a significant effect on correspondingly small particles. For example, the tails of comets point away from the Sun partly due to light pressure. The propulsion of light spacecraft via light sails has also been discussed repeatedly, most recently in connection with the “starshot” project, in which a fleet of miniature spacecraft is to be sent to Alpha Centauri.

May 22, 2022

Should we send robots on space missions

Posted by in categories: government, robotics/AI, space

Should we send robots on space missions instead of humans?

The cost differences are huge. In fact, NASA could pursue dozens of robotic missions for the cost of a single human mission. Also worth considering–wealthy entrepreneurs have made great advances recently with private space efforts.

Given the large ambitions for private human space flight, isn’t it time to phase out NASA’s human missions? The private sector has gained ground, and so the government should yield.

Continue reading “Should we send robots on space missions” »

May 22, 2022

Researchers explain how auroras are formed on Mars without a global magnetic field

Posted by in categories: physics, space

May 22, 2022

Hubble data suggests ‘something weird’ is going on in the universe

Posted by in category: space

May 22, 2022

Voyager 1 Space Probe Is Suddenly Sending NASA Wacky Data

Posted by in category: space

Woah.


Voyager launched in 1977, and now humankind’s most distant object is transmitting data that doesn’t make sense.

May 22, 2022

Scientists Say There May Be a “Mirror World” to Our Own

Posted by in categories: physics, space

Three researchers published their findings this week in the journal Physical Review Letters and say their hypothesis is based on problems with the Hubble Constant, the rate at which the universe expands. Yesterday’s SciTechDaily report on the study says predictions for that constant are a lot slower than what we’ve measured in reality, and scientists are trying to figure out what’s causing the discrepancy. They say the cause could be a mirror world we can’t yet see.

“This might provide a way to understand why there appears to be a discrepancy between different measurements of the Universe’s expansion rate,” researchers said in a statement about their findings.

Scientists have long built models of the cosmos. Now the task is to create one that doesn’t violate any of the rules cosmological rules we’ve learned so far. The researchers say that if the universe is somehow exploiting what we know about its physics and symmetry there could be an invisible mirror world very similar to ours but invisible except through gravitational impact on our world.

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