galaxies: formationgalaxies: fundamental parametersgalaxies: irregularUsing a novel approach we have reanalized the question of whether the extreme star forming galaxies known as HII galaxies are truly young or rejuvenated old systems. We first present a method of inversion that applies to any ...
If you’ve ever asked questions like: How old are the stars? When did the universe begin? How many galaxies are there? Do aliens exist? Or why do planets have rings? then consider pursuing a career as an astronomer. Maybe your next discovery will change the world....
根据第一段“Do you know anything about galaxies (星系)? Are you interested in them? How many galaxies can you name? Researchers have identified two ancient star groups that appear to be among the Milky Way Galaxy’s earliest parts. The groups are named after the Hindu gods Shakti and ...
Formation of a low-mass galaxy from star clusters in a 600-million-year-old Universe Article 11 DEC 24 Distant sparkles hint at how the Milky Way formed News & Views 11 DEC 24 The first rocks from the Moon’s far side are in this geologist’s hands News Feature 09 DEC 24Jobs...
A. stars and galaxies B. rock and comets C. hydrogen and helium D. gas and space dust 5. When will humans disappear from Earth? A. in a 1,000 years from now B. in 100 million years from now C. in a bi...
But considering we don't actually know the size of the universe, those estimates are murky. "If it's an infinite universe, you're going to have infinite galaxies," Gay said.
But how many galaxies are there? Counting them seems like an impossible task. Sheer numbers is one problem — once the count gets into the billions, it takes a while to do the addition. Another problem is the limitation of our instruments. To get the best view, a telescope needs to ...
aBut scientists have discovered many other galaxies in the universe. They are a long way away and their light has travelled for many years to reach us. it ishard to understand how large the universe is. 但科学家在宇宙发现了许多其他星系。 他们是长的路,并且他们的光移动许多年到达我们。 它...
How do we know how old the universe is?Astronomersestimatethe age of the universe in two ways by looking for the oldest stars. Is the universe infinite?Astronomers are unable to see thelimitsof our universe, only a limit to how far we can see (the observable universe). ...
A new hypothesis suggests that the universe may be twice as old as we had believed. Observations from the James Webb Space Telescope provide new information on the rate of the universe’s expansion.