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What are the ten brightest stars in the night sky?
I'm just going to copy & paste this answer because typing it out wouldn't yield in any differences text-wise.
1. Sirius
Sirius, also known as the Dog Star, is the brightest star in the sky. Its name comes from the Greek word for scorching.
Distance: 8.6 LY
Spectral Type: A1Vm
Learn More:Â Sirius
2. Canopus
Named either for an ancient city in northern Egypt or the helmsman for Menelaus, Canopus is the second brightest star in the sky.
Distance: 74 LY
Spectral Type: F0II
Learn More:Â Canopus
3. Rigil Kentaurus
Rigel Kentaurus, also known as Alpha Centauri, is the third brightest star in the sky. Its name literally means foot of the centaur.
Distance: 4.3 LY
Spectral Type: G2V
Learn More:Â Rigil Kentaurus
4. Arcturus
Arcturus is the brightest star in the constellation Bootes, which is one of the oldest constellations in the night sky. It is the 4th-brightest star in the entire sky.
Distance: 34 LY
Spectral Type: 5IIIFe-0.5
Learn More:Â Arcturus
5. Vega
Vega is the fifth brightest star in the sky. Its name comes from the Arabic for the swooping eagle. Vega is about 25 light-years from Earth.
Distance: 25 LY
Spectral Type: A0Va
Learn More:Â Vega
6. Capella
The sixth brightest star in the sky, Capella's name is from the Latin for little she-goat. Capella is a yellow giant star, like our own sun, but much larger.
Distance: 41 LY
Spectral Type: G5IIIe+G0III
Learn More:Â Capella
7. Rigel
The seventh brightest star in the sky, Rigel's name is from the Arabic for foot, indicating its place in the constellation Orion. It is a blue supergiant and part of a 4 star system.
Distance: 1400 LY
Spectral Type: B8Ia
Learn More:Â Rigel
8. Procyon
Procyon is the eighth brightest star night sky. It is a yellow-white star and at 11.4 light years, one of the closer stars to Earth.
Distance: 11.4 LY
Spectral Type: F5IV-V
9. Achernar
The ninth brightest star night sky is Achernar. It is a bluish-white white supergiant star that is about 69 light years from Earth.
Distance: 69 LY
Spectral Type: B3Vpe
Learn More:Â Achernar
10. Betelgeuse
Betelgeuse is the tenth brightest star in the sky. It is a red supergiant about 13,000 times brighter than our sun and over 1000 times larger. If you placed Betelgeuse in the place of our sun, it would extend past the orbit of Jupiter.
Distance: ~1400 LY
Spectral Type: M1-2Ia-Iab
Learn More:Â Betelgeuse
I hope that answered your question!
Main Source. Second Source.
How fast is the universe expanding?
The universe's expansion rate, which is also known as the Hubble constant, as reported in 2006, is at a constant of 48 milers per second per 3.26 million light-years [77 kilometers per second per 3.26 million light-years].
The previous measurements arrived at the value of 72 km/sec/3.26 million light-years with an uncertainty of 10%.Â
You can read more about it here at the source.
I hope this answers your question.Â
Thank you for the wonderful ask!