How long does a sunspot (or solar activity cycle) last? A. 200 years B. 11 years C. 7 months D. 6 weeks
A sunspot (or solar activity cycle) lasts: 11 YEARS.
Question
Updated 9/28/2014 11:04:50 AM
Rating
3
A sunspot (or solar activity cycle) lasts: 11 YEARS.
Confirmed by yumdrea [9/28/2014 11:11:55 AM]

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_________ is the force that Earth’s gravity exerts on the object. A. Energy B. Weight C. Mass D. Pressure
Weegy: Weight is the force that Earth’s gravity exerts on the object. (More)
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Most observatories are located on _____________ to avoid light pollution and air turbulence. A. mountain tops B. crowded streets C. river basins D. ocean bottoms
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Most observatories are located on mountain tops to avoid light pollution and air turbulence.
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Electromagnetic radiation travels at the speed of ________. A. sulfuric gas B. heat C. light D. water
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Updated 39 days ago|8/11/2018 6:38:42 AM
Electromagnetic radiation travels at the speed of light.
Added 39 days ago|8/11/2018 6:38:42 AM
From the 1960s through the 1990s, NASA developed a series of observatories with telescopes carried by ________. A. 18-wheelers B. pack mules C. freight train D. jet aircraft
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Updated 352 days ago|10/2/2017 7:48:21 PM
From the 1960s through the 1990s, NASA developed a series of observatories with telescopes carried by jet aircraft.
Added 352 days ago|10/2/2017 7:48:21 PM
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