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An astronomer observes 1,000 galaxies positioned within 5 Mpc of each other in a galaxy cluster.What other quantity or quantities should he or she measure to determine the mass of this cluster?
Bid-ask Spread
The gap between the maximum price a buyer is ready to offer (bid) and the minimum price a seller agrees to sell (ask) for an asset.
Market Maker
A firm or individual that actively quotes both a buy and sell price in a financial market, providing liquidity and facilitating trading.
Total Profit
The overall financial gain made by a business after subtracting all costs from the total revenue.
Maximum Profit
The highest possible financial gain achievable from business activities, after deducting all related expenses.
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